I have a 94 GMC 2500 with a 5.7 TBI. Once the motor warms up, if I accelerate to the floor it will hesitate and back fire through the TBI and then takes off. I have changed and checked about everything that you can and I still can't figure out what is wrong. So does n e one have n e ideas? [:@]

 

My best guess would be that its a fuel delivery problem, but hang tight and argon or smoke20 should be here shortly to help you out.

 

it seems if anythang it may get to much when i kick it down it will shoot a huge flame bak out when i have the air cleaner lid off beside that it runs like a new truck i hope sumbody can help me im pretty smart about these thangs but this got me stump lol thanks oh

 

its firing at the wrong time if its backfiring...

check the dis cap first...the timing,then i'd probably go with a rebuilt dist as these tend to lose magnatism over the years.

this is assuming its wired correctly,and stabbed in the correct tooth...no one was working on it?..it just developed this backfire?

 

yes no one worked on it.

 

It begs the question:

Why are you dropping the hammer to the floor? I would assume 99% of all vehicles are going to make some kind of worrysome noise if you floor it.

I've never found a reason to mash it like that. I'm afraid I'll hear that terrible "BANG" and I'll have to purchase a new truck.

 

old man

 

I see where MajorSilva is coming from but still, my 91' I could floor it from a dead stop all day long and no backfire. There is something that needs a fixin there.

 

major, are you trying to tell me you never romp on the gas pedal? what kind of life is that?

 

no kiddin you gotta give it the juice once and a while! cmon..just not all the time....that leads to problems really quickly!