RonD.

87 951 80K Some upgrades done may 2018 Super 48 Spec 3 clutch custom chip Dual-port 3 Bar MBC Solid AFR's Headgasket belts ICV etc.No MAF Stock AFM and Air box. Story short. ha ha, car has not skipped a beat 10k+ since 2018. Runs perfect to shop for 321 Headers and motor mounts. While at the shop post install car heat cycled, on idle only(20+ minutes) several times for stud re-torque, with no problems.Vehicle was not road tested prior to pick-up, dissappointed, but assumed all should be good. Sits overnight inside mech. Started, idle dead solid, driven outside to parking spot on shop lot no problems. Return to shop for pickup car has sat couple of hours popped hood check out the work with mech. very nice. Started runs perfect on idle warm-up rev motor no leaks all good. Upon pulling out from shop almost stalls barely runs drive two blocks return to shop I hope its just a obvious vacuum leak(large) with mech. Opened gas cap Vapor Lock? No change. Start car barely idles when it does, drops way down bumps back-up then stalling Repeat process using throttle to keep running miss fires popping back through airbox. Check plugs wires disconnect afm everything poss., while hot, all good no sucking sounds or hissing mech. sprayed starting fluid to various areas especially ICV no change. Leave the car at shop. Leave to go home, hour later mech. calls says car sat cooled, started, to move it in lot. Car idles perfect, revs no misses, takes for a 20 min. drive doesn't beat it but puts on boost pulls fine. Stop lights, idles perfect. Mech. and I decide to leave it for the weekend to see what it does Monday possible smoke test. I know this will show if vacuum related but if no leaks, thoughts on other possibilities?

Let me first apologize for rambling,

Have a Good Weekend

Ron D.

MAGK944

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kev951

What kind of lift was the vehicle placed on? I've seen some of our cars scrape on four post alignment style lift s which end up pinching the fuel return or send or both lines.

mtnman82

MAGK, I need some passes too...