Runs then slows then stalls - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-31-2009, 10:35 AM   #1
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Recently,last few days noticed a miss and on thurs. driving home started getting less power, then stalled near redlight,started up again had enough to slowly drive home,
that night changed plugs,had Bosch in , changed to NGK -AdvancedAuto,
ran it a few minutes,doing better,a little slugish to respond,Next day changed oil/filter,
went to get gas,few mins. fine then stop sign sluggish,barely made across then suddenly a slow burst of energy,filled up to reassure full tank,drove a block well then at stop sign
no burst, then slowly responded, drove close to N-hood,then stalled at stop sign, pushed home,would not start,ran down battery slightly,went out later 1hr ran ok able to back into drive,Trying to read some info to help my issue,any clue to problem, also forabout 3-4 monthsthe transmission(supposedly) is sluggish,we put into 2-3 to take off works to take-off then we put back into Drive, Ithought it was the 1st gear going bad,trying to limp along
$$$$$$, 7yrs.ago we blew up engine 99,950 miles,installed rebuild,Now 196,000 having sluggish take-off and now this Please help with a solution. I have had this car since 2000
Dad had prev.3 yrs.well taken care of, HHHHEEEEELLLLLPPPPPPPPPPPPPPPP!
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Old 05-31-2009, 10:54 AM   #2
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Check for vacuum leaks. Also try taking a spray bottle of water and misting the plugs, wires, and coils, then turn off the lights and watch in the dark for any blue flashing. If you see that you need to deal with that. Also test the coils and TPS, both of these are covered in the tech info area.
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Old 06-03-2009, 06:34 AM   #3
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I found no arching, checked for air leaks, came home today ran fine for 10 mins then slowly started to peter out, then would not start back up, couldn't be fuel pump whats happening, we had 14 days of rain then i had problem
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Old 06-03-2009, 08:09 AM   #4
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Test your coils. Starting to sound like a weak spark
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Old 06-03-2009, 08:29 AM   #5
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I'd also check the exhaust for back pressure.

Sounds a bit like a clogged cat taht won't let the engine run.
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Old 06-03-2009, 06:34 PM   #6
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When I first noticed a slight miss in exhaust last week, I thought it maybe a plug , Changed plugs , still hearing a litte miss from exhaust,I usually work till 5-6, I came homeMonday and Y-day,ran it for about10-12 mins ran fine, then tried to rev-up, noticed it was mellowing out ( geting warm) during rev-up hearing miss and puff of air or what ever you call it in motor, so it gently stalled, No hard problems just stopped, I do not think its fuel pump DO YOU? something with heating up, from other sernarios that I have read in threads. Thanks for you help, I Do not have alot of money to replace things that isn't the problem and possible parts that Advanced will not take back!
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Old 06-03-2009, 07:22 PM   #7
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Pull the coils and check for corrosion. How did the plugs look? Did they all look the same?

I agree with Bill, pull your O2 sensor and start the engine. You will get a SES light and it will run rich. But if the cat is clogged it whould run better because the gasses can get out threw the O2 bung.
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Old 06-03-2009, 08:00 PM   #8
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I had my neighbor(mechanic -hot rods) help me quick before it rained i unplugged the o2 sensor,
would not start plugged back and started running rough, only way keep running is move throttle
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Old 06-03-2009, 08:07 PM   #9
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Not unplug, remove from the bung.
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Old 06-03-2009, 09:23 PM   #10
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we pulled both disconnects to the fuel lines on top of motor cranked engine neither hose had fuel come out,
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