Hesitation under acceleration only when cold?

1990LXstang

Founding Member
Nov 5, 2002
227
0
0
West Haven CT
Hey guys, My car just started to hesitate yesterday under acceleration. However the hesitation stops when the car gets up to normal operating temperature. Do you guys have the slightest clue on what it could be? I just finished my t-5 swap... could that do it? Any help would be great guys. Thanks.