HELP!!!!popping back through intake

88b2

New Member
Apr 13, 2005
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can't seem to solve this problem.........about 60-90 seconds after starting my 5.0 HO (engine cold/hot, outside temp cold/hott makes do diff) it idles really rough for about 30-60 seconds......if i'm driving during this time it poppes back through the intake and has a lack of power.....but after 30-60 seconds i get my power back and it runs perfect until i shut it off, and turn it back on and the cycle starts over again. i've replaced: ECT, ACT, 02s, MAP....checked fuel pressure its 32 @ idle, floor the pedal and let off yields a jump to 40psi and back down to 32. uncap the FPR and it jumps up to 41ish psi.....drops 2 psi in 20 min.........so that eliminates injectors, FPR, and fuel pump. I have deleted EGR, and the thermactor system. I have the computer fooler for the EGR and have left all the solenoids plugged in for both the EGR and the thermactor stuff......however i don't have vaccum lines run to them. my codes are: 94,44,33,13. thanx alot!!!!
 
You provided a bunch of info, thats great. I suggest a Charles Probst book, you should be able to understand it if you got this info yourself.

I take it you car is an 88, how many miles? Original injectors? There was a problem with these crapping out at 100,000 mi. Is it 5-speed or auto? Seperate your codes into continuous (KOEO) and running (KOER). They mean different things.