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Username Post: 1990 K1500 5.7 will only idle won’t run        (Topic#358040)
Posts: 41

Reg: 10-01-17
09-13-19 08:10 AM - Post#2775453    

Hey all, I have a 1990 K1500 5.7 that is having a very odd problem. I can start it, it rough idles then steadies itself out (sometimes it will just randomly stall while idling for a little bit but not every time). If i give it any amount of gas it wants to die and backfires a lot (sometimes stalls out if i don’t let off the gas in time) unless i give it throttle almost “1%” at a time but undrivable on the road. New timing chain, distributor cap/rotor, ignition control module, map sensor, spark plugs, fuel filter, drained the tank put fresh gas in it and fuel treatment, coil, it’s on time, and has no check engine codes coming up at all. Was having a electrical problem as well but that was solved. At this point have no idea where to go from here and I really have to get this truck running soon. And when i do rev it up very slowly everything sounds great, except just about open throttle, then it just backfired the entire time. I can even let it cruise around the yard won’t stall out (usually).

Edited by hawk1122 on 09-13-19 08:12 AM. Reason for edit: No reason given.

"10th Year" Silver Supporting Member
Posts: 4443
Loc: Salt Lake City
Reg: 06-20-09
09-13-19 10:50 PM - Post#2775490    
    In response to hawk1122

Please stop spending money on parts and check your fuel pressure.


'95 K1500 Z71 EC Short Step 5.7L+0.040/NV3500
'00 Explorer XLT 4.0 V6 Auto
'94 K2500 5.7 NV4500 ECLB - SOLD
‘87 GMC S15 SCLB 4.3 Auto - SOLD

"The only thing necessary for evil to triumph is for good men to do nothing" Sir Edmund Burke

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