I installed a 2000 camero slp motor and trans in my 36 chevy with painless wiring harness 3.50 rear gears the problem is when i step on the accelerator the engine bogs will not even break the tires loose and if i am going 15 mph or so and stomp on the gas the engine stumbles then goes but not like i expect my buick v6 performs better any ideas no engine codes