350 1983 Z28
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Junior Member
Joined: Oct 2008
Posts: 43
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From: Virginia Beach
Car: 1991 Camaro RS
Engine: 406
Transmission: t5
Axle/Gears: 373
350 1983 Z28
I SWAPPED IN A 350 FROM A LG4, IM STILL USING THE CC CARB & DISTRIBUTOR. IT RUNS VERY ROUGH WITH THE ECM, BUT IF I UNPLUG THE ECM IT IDLES ALOT SMOOTHER. IT SEEMS LIKE WITH THE COMPUTER THERE IS A MISS. ANY HELP WOULD BE APPREICATED.
Supreme Member
Joined: Apr 2002
Posts: 3,552
Likes: 5
From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: 350 1983 Z28
When you set the base timing did you unplug the bypass connector? What is it set at?
Thread Starter
Junior Member
Joined: Oct 2008
Posts: 43
Likes: 0
From: Virginia Beach
Car: 1991 Camaro RS
Engine: 406
Transmission: t5
Axle/Gears: 373
Re: 350 1983 Z28
YES I UNPLUGGED THE ECM, SET TIMING AT 8. I JUST PUT IN A VACUUM ADVANCED HEI WITH TIMING AT 12. IF I STOMP THE GAS ROLLING AT 20 MPH IT WILL NOW BURN THE TIRES!
Supreme Member
Joined: Apr 2002
Posts: 3,552
Likes: 5
From: New Jersey
Car: 86 Corvette, 89 IROC, 1999 TA
Engine: 350, 350, LS1
Transmission: 700r4, 700r4, T-56
Axle/Gears: 3.07, 373, 4.10
Re: 350 1983 Z28
you unplugged the ecm or the est bypass connector? If you're swapping to a non-cc dist you need to swap to a non-cc carb as well.. if the old 305 ran fine there's no reason it can't run fine with the 350, I'm betting its timing related.
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