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Old 02-28-2012, 09:11 AM   #11
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Low fuel pressure can also cause random misfire. Change the fuel filter and check fuel pressure at the rail.
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Old 02-28-2012, 12:40 PM   #12
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replaced fuel pump last June, can't get the fuel filter loose the only way I can replace it is to cut the line.
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Old 02-28-2012, 03:57 PM   #13
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Originally Posted by blkhwk7 View Post
replaced fuel pump last June, can't get the fuel filter loose the only way I can replace it is to cut the line.

Then check fuel pressure. A plugged fuel filter can cause random misfires.
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Old 03-01-2012, 06:52 PM   #14
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update: changed ICM today and checked fuel pressure, also got 4 cyclinders compression checked (range 135-165). Going to attempt fuel filter tomorrow, that'* pretty much my last effort.
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Old 03-07-2012, 09:09 PM   #15
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fuel filter changed, fuel pressure at 42#, checked all the coil packs, checked voltage at FI connections, changed ICM and switched injectors and still have the same problem at low rpm'*. I talked with someone yest who said it could be the throttle body, any one heard of this?
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