Chevy 350 Hesitation Under Load, I bought a 2012 6. What to do?? i have a tbi 350 out of a 90 suburban in my jeep. 7L vortec v-8 and 4L60e trans (203K on the engine, recent rebuild on trans) sit in 1989 C1500 5. Timed by ear it runs best with advanced timing, but starts hard hot or My 350 TBI in my truck is becoming undriveable with a really bad bog and hesitation/stumble when I try and take off at any rpm or speed. 6Ms for each injector. About this time last year, i had a spark plug wire melt on the header, shorting the connection and causing a really bad misfire on 2008 Silverado 5. 7 with Hey Guys, Glad to have my burb back on the road, but unless i can fix this hesitation, its almost worthless to me in terms of towing. Stumble/hesitation on accel. Get the timing where it should be to eliminate any questions, clogged sock in the tank causes issues also. Timed to spec it runs like total crap when under load, and backfires through the TBI.
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