The Corvette Kid

I have a ls3 crate engine in my 61 Vette and it bucks while driving at a steady speed. The engine idles fine and no problems when I accelerate and shift through the gears, but once I start driving at a steady speed the engine bucks. The check engine light has not come indicating that any of the sensors are bad. This is the 3rd year the engine has been in the car, and this is the first problem with it. Any help or suggestions would be greatly appreciated. Thanks, Bob

Old Geezer

iTrader: (3)

Time for some datalogging...........

edcmat-l1

iTrader: (10)

If it's a GMPP crate motor with a GMPP calibration, the calibrations leave a lot to be desired. Plus, when you put the MAF in different CAIs it tends to make them quite "twitchy". Seen it many times.