98 350 vortec 5.0 liter

Asked by Oct 29, 2017 at 01:03 AM about the Chevrolet Silverado 1500

Question type: Maintenance & Repair

I get in and start my truck that runs just fine,i put it
in reverse and as im backing up all the sudden it
starts running like its only hitten on 4 cylinders.
Sometimes its a constant backfireing and
sometimes it doesnt backfire at all. Loss of power,
hard to start. Yet i can still drive it down the hwy @
75 mph. Its been parked now for a cpl weeks with
me only having moments after work to mess with
it. Ive always had a problem with it starting,only
occasionally tho it would start but instantly die i
could either put a rag soaked in gas where the air
filter is or i could wait 10 min and it would start just
fine.

1 Answer

8,735

see if the injectors are firing normally unless you have the TBI unit on top the motor then just see if those injectors are working ,, , test or replace ignition module , and if you can purge the fuel rail at the valve see what the gas looks like , check plugs , wires ,coils , I used to think parts (alt. fuel pumps ) ,would just quit but thats not always the case ,intermediate problems are the worst because the problem has to be tested when it occurs otherwise it'll test normal , a gas soaked rag is asking for problems get a soda bottle with a pin hole in the cap and squirt some gas in the throttle if you have to ,

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