ok so i had a problem w/ my car before (ses came on, and car ran like crap) so turns out that i had to get a new ecm and prom chip, so i did, car runs now, but when i step on the gas, the rpms go up, then back down about 500rpm-almost like hesitation, and you can feel it . . . so my question is, is there anything that i can do, does anyone reccommend anything? i already took it back to the guy that fixed it, and he says its normal-but my car never did this before, and another thing that i noticed is that my car runs hotter, it used to go up to a little after the first quarter mark, now it goes to the center mark!!! not too happy about it; told the guy about that too and he says because its hotter out now that the car is gonna run hotter cause i took it out the other night, it was pretty cool about 60 and it ran to the center mark-even if the car sits there-it still goes the the center mark

HELP ME!!!!!!!!!!!! i'm just guessing that its the new chip and ecm thats doing it . . ..what do u guys think . . ..