massair question part 2

[Coupe50h]

If you saw my post a week ago you'll know what im talking about.

my buddy sold me his pro-m 77 flanged nasty big ugly thing, actually im not paying him until i figure out if it will work right.

Could it be too big for my setup? Because i threw it on, and it runs like crap, barely would idle, i finally got it to learn the idle, but when im at a low speed it bucks, and "blub blub whaahhh" takes off alright on the topend, in other words, I think it lost lowend, I only drove it about a mile, so it may have not learned it's tables yet, I guess i'll disconnect the battery once again and see if it learns it.

I do know it works cuz my friend just used it, turned a 13.1 @ 108 with a 165 afr/f-cam/gt-40intake setup, and that was on khumo radials.
I guess i'll give a few long trips and see what happens.
Any advice welcome. thnx