1997 Holden Commodore engine misfiring under load

1997 HOLDEN COMMODORE
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CROM93
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Engine Performance problem
1997 Holden Commodore 6 cyl Two Wheel Drive Automatic 200.00 miles

hey i have just recently serviced my commodore and put injecter flush in tank . after washing the engine down i noticed on the test drive it was misffiring and backfiring mainly underload . i replaced the spark plugs and leads checked fuel injectors ok . ckecked blocked catalyc converter ok , found runing pretty much th same wen disconected the no and no sparkplug leads im thinking it may be crank angle scencor or coils wat do u think and how would i go about confirming problem with coil
cheers
Mar 25, 2009 at 7:25 AM
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SCOTTIE666
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Crom93,
mine is doing the same thing bud, and i have done the exact things you have done. i have asked around and nobody can seem to give me answer. i'm maybe thinking something internal. i will let you know if i get an answer. i have posted questions on just commodores so hopefully i will get an answer soon.
talk laterr
scott
Apr 4, 2009 at 6:09 AM
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BADVK84
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well i had an identical problem in my VR Calais under load it would miss badly and got to the extent where i couldn't drive it. the problem was the check valve in the fuel pump not allowing the fuel pressure underload. i suggest not getting a "fuelmiser" brand pump from autopro you are better off to get a bosch or get a genuine pump from holden.
Apr 22, 2009 at 3:14 AM
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