i have 2000 gp gt 3800 with 150,000 miles on i. just recently ive had hesitation/ misfiring problems and my car was gutless at same time. first off, changed plugs /wires b/c they were shot. find out from a mechanic friend that i had a vacuum leak. had a new intake manifold /gaskets put in. also replaced cat thinking that it may have been plugged. got a lot of my power back but car still hesitates when its cold. unplugged maf to see if that would cure it but to no avail. keep in mind it only hesitates when cold and onlywhen driving. otherwise idles just fine. stumped at this point and need help