Porsche Forum - Porsche Enthusiast Forums - 944 stumble and loss of power

hey guys any help would be much appreciated.... my 83 944 n/a sat for a few months went to drive it and it is having a serious lack of power at lower rpms if i feather the throttle lightly i am able to get somewhat of a consistent throttle at about 4k rpm's......... i un hooked my tps thinking that maybe the issue however all that happened was an increase in idle speed. checked for vacuum leaks none found.......... also i put some seafoam in the tank to cure any moisture issues and a half a tank of fresh fuel........... the weirdest thing is the longer i drive it the better it gets....... as soon as it cools down runs like crap again, but as drive time extends it gets better and better but it never runs at 100 percent please help!