TPS problems on an 87 Chevy K10
 

Ok so I got in my truck today, left my road and shifted into 3rd, then the whole truck started bucking. I threw it into neutral (manual trans) and it stops, so I pull over and mess with the TB and everytime I would open it up it would act as if I was feathering it. Then I started messing with the TPS and nothing happened what so ever, also I had a extra TPS so I put that on and still nothing.

A little extra info, Its a Holly 670 CFM TBI, I already replaced all the vacuum lines, also I have replaced the EGR as well.

Thanks in advanced

Re: TPS problems on an 87 Chevy K10
 

Why are you messing with the tps? First check your ignition system out and then verify your fuel pressure.

Re: TPS problems on an 87 Chevy K10
 

Well I replaced the whole fuel pump assembly about 8 months ago. The problem is not it missfiring on idle it runs fine but when I move the tps no extra fuel is introduced in to the tb it runs as if its still idling.
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Re: TPS problems on an 87 Chevy K10
 

Those holley tbi units are set from the factory with the pressure reg adjusted to high check it again, also plug the egr vacume line see if its egr related.

Re: TPS problems on an 87 Chevy K10
 

I need some more ideas, nothing has worked so far.
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Re: TPS problems on an 87 Chevy K10
 

My truck was just doing the same thing,and when I changed fuel filters it went away. I had changed them about 10 months back but I let one of my tanks get really low and it must have gotten plugged then. Hope that helps!
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