Question about 1988 Chevrolet Suburban

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I HAVE 1988 FUEL INJECTED 5.7 BLAZER

WHEN DRIVIG THE FIRST 6 MILES OR SO RUNS GREAT AND THEN STARTS TO POP OUT OF THROTTLE BODY AFTER 3 MILES OR SO STRAIGHTENS BACK UP AND RUNS FINE

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  • trikin69 Feb 17, 2009

    very helpful thankyou very much

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Chk. the egr valve for vacume and if it is functioning, might be pluged up with carbon deposits.

Posted on Feb 14, 2009

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1988 5.7 TBI Nightmare This is the start of what the problem was and is, I had a RV cam installed when the engine was rebuilt a year ago. the cam was not a computer friendly cam so after a round with the rebuilder and discovering the specs weren't the correct ones for the cam I installed a 3702 edelbrock cam and lifters with a 7800 timing chain and gear set after I had tried two chips from Jet and no improved performance and the 3rd chip was to be for the cam and that is what is in the ECU now and I have tried about 5 different BCC chips and the bottom line is the power is there but something is happening its hit and miss the idle will sometimes lope, is stalled when first started and acts as if its starving for fuel or its bogged with to much fuel. the fuel pressure is 10 - 13 psi and I have R/R the TPS, IAC, ESC and knocks device , EGR and Solenoid, MAP, Temp sensor, and the Dist is a Procomp 10001 with a MSD-5526 coil. the Throttle Body was rebuild and the ECM was replaced with a Rebuilt ECM. it will smell rich etc. but with the things that goes on it does not show any codes?? I have no clue just feel stupid this is been a simple thing that is kicking my **** and now its a challenge but still loosing the fight too far in and too much spent to stop,. LOL Help !!!! The BCC is a california vehicle AFBX, 5.7TBI TH400 A/T P.S. the key can be turned of and back on as the engine not dying and seems to correct the power and run problems but will not last goes back to running bad or with problems. ?

Jul 26, 2012 | 1988 Chevrolet Suburban

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