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90 missing under load?

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Old Mar 5, 2009 | 05:43 PM
  #1  
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From: hinton ia
Default 90 missing under load?

well my 90 vette seems to miss under load at full throttle only, say I'm driving down the highway at 75mph 6th gear 1200rpm I floor it and it accelerates but misses at the same time, its only obvious at low revs but I can feel it at higher revs too. the fuel pump and filter have been replaced but i have had this problem for a while now. with normal driving it doesn't appear to happen but if I floor it under much load it will start to miss and it will do it in all gears but more in the higher the gear and the more the load. like I said it doesn't do it at like 3/4 throttle only at full throttle or very close to full throttle. the injectors were replaced about 4000 miles ago. my only guess is fuel pressure regulator? if I take that vacuum line off and smell it, it smells like gas but does not appear to be damp. I'm stumped. Please Help! thanks Pat

Last edited by 396chevy; Mar 5, 2009 at 05:48 PM. Reason: spelling and grammer
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Old Mar 5, 2009 | 06:15 PM
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Post question over in C4 Tech for better response

This is General section ;
what color should I paint my lugnuts sort of questions
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Old Mar 6, 2009 | 08:03 AM
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check your cat if you have one that is. my friends 90 did this but had different things happening besides what you are saying.
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Old Mar 6, 2009 | 04:20 PM
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Could be spark plugs.
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