Re: Pulling the Plenum for the first time...
I doubt that its the TPS or IAC, if they were not removed. I am more inclined towards a vacuum leak associated with the work that was done. Its not unusual to have a cracked hose or leaking connection when re-installing the plenum. It's a little tricky keeping it all connected. You should backtrack your work.
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Jerry Downey
JERRYS LT5 GASKETS & PARTS
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1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc.
2016 Black-Red, 3LT-Z51 Auto 8-speed.
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