[69MyWay]

My Camaro just started acting strange - looking for ideas.

2000 LS1 with SLP Stage III head/cam and 36# injectors - TCI steet fighter and 4L60E trans through a 3.5 Ford 9" - headers, x pipe - and tune by Speed Inc.

If you accelerate up to speed (hard or easy) to the point it goes into 4th and lock up (around 60 mph) - then throttle back - it starts bucking and chugging like a tractor. It stays locked up and just thumps like a manual shift car in too high of a gear trying to drive too slow.

If you throttle down it will go.

No check light - the misfire codes and other sensitivities have been turned off in the PCM tune due to the cam...etc.

My guess is a bad coil or plug - but not sure.

Fuel pressure is good.

WOT, tip in, acceleration - all good.

Cruise in lock up - bad.


Thoughts?