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I got an 89 Gmc sierra Pickup with a tbi 350 in it i just replaced all the sensors and i can figure out why at idle it sounds like it wants to die and it gets even worse when u put it in gear. When your runnin it though it runs good just when it has a load or sitting at idle it runs like crap. and also what kind of AC DELCO plugs should i run in it

after putting in the new sensors did your reset your computer? and also you mide need to adjust the idle screw a little... could also be a timing issue...

where is the idel screw on a throttle boddie

dont know your setup exactly but ussually its right next to where the accelerator cable connects up

have you checked for vacuum leaks? had a buddy who's truck was doing the same thing, the basket under the throttle body was trashed.

you should have tour cat checked to see if it is plugged or starting to plug this will give you this kind of problem also
dave

Originally Posted by WRENCHD

you should have tour cat checked to see if it is plugged or starting to plug this will give you this kind of problem also
dave

That would have been helpful 2 years ago.

the most common problem on those tbi's is the gasket between the tbi and intake manifold they are thin paper and they fail all the time. there is no idle screw its controlled by the computer with the idle air control valve (I.A.C.V.) on the tbi unit...ted

Originally Posted by ted dehaan

the most common problem on those tbi's is the gasket between the tbi and intake manifold they are thin paper and they fail all the time. there is no idle screw its controlled by the computer with the idle air control valve (I.A.C.V.) on the tbi unit...ted

Like I said, that would have been helpful 2 years ago. Look at the date of the original post.