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Old 01-24-2015, 03:01 PM   #1
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Default 95 chevy 2500 with 5.7 misses

My 95 chevy 2500 has a miss to it that I cannot seem to put my finger on. I replaced the fuel filter, spark plugs, plug wires, coil, gasket between the throttle body and the intake, cleaned the throttle body and now just replaced the throttle position sensor and I cannot get it to stop missing. If someone could help me I would greatly appreciate it!!
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Old 01-25-2015, 03:25 PM   #2
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Distributor cap and ignition rotor?
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Old 01-25-2015, 03:41 PM   #3
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Yes I also did them. Sorry I forgot to add them to the list.
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Old 01-26-2015, 08:28 AM   #4
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check fuel pressure? should see a good solid injector pattern when running with no drips. any other weird running? codes?
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Old 01-26-2015, 10:13 AM   #5
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I looked at the injectors and watched them spray and they have a nice clean even spray no real big drips or anything. Unfortunately I don't have a way to check fuel pressure or a code reader, but the check engine light is not on either. I'm just not sure where to look
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Old 01-26-2015, 10:16 AM   #6
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I took the idle air control valve out and wiped it clean also. Is the part on the end supposed to move somewhat freely? There'* a spring there and then what I believe is the valve on the end, but I couldn't make the end part move any. I didn't try too hard because I didn't want to damage it though. Could that be a problem? I've worked on vehicles and engines before but the sensors and such confuse me a little
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Old 01-26-2015, 12:21 PM   #7
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IAC valve should not be causing a misfire. Do what JW suggested and get the fuel pressure checked. Most parts stores will loan them out for a deposit.
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Old 01-26-2015, 04:52 PM   #8
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Is this TBI?
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Old 01-26-2015, 04:58 PM   #9
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you need special fittings to check it on those. how many miles? sometimes the time has drifted if its got some miles, has to be set back to zero. its tough with no codes and no live data. sometimes its a mechanical issue, like carboned valves. compression would be a good thing to check.
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Old 01-26-2015, 04:59 PM   #10
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95 is tbi with obd1.5 one of the biggest pains to trouble shoot out there
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