Quote:
Originally Posted by ernbuild
Have powder coated the engine, while it was apart, because it had the same problem. Found a large vacumn pipe not connected under the phelnum, and when it went back together it was pretty good ,not perfect but a lot better. Seems to have gotten worse all of a sudden.
Have not had it on a tuner as they are hard to find out here.Only know of one guy that has the right gear. Have a haibeck chip in it, will that make any difference to the tuner.?? 
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If you powder coated the throttle body and if they took apart the inside of it, that could be your problem. When my motor was powder coated, they took apart my TB and "adjusted" it. My car was running @ 2000 rpm @ idle. Using a tech 1 had no affect.... I spoke to Marc H and he said to send his TB to him and re would recalibrate it.
He did and fixed the issue! Problem is, I used a tech one to take the idle down and it did.... To where I had no idle! Had to trailer the car to a chevy station to raise the idle.
That "could" be your issue, if the shop took apart your TB.
Cheers