trinidad martine

OK,its got a new ecu,alternator,thrormastat,igniton modual,cap&rotar, plugs& wires; Checked all the fuses, vaccumes, fuel pump & lines. now all of that has helped alot but after it runs for a bit and i shut it off- it wont start,unless i let it sit for an hour. also when its cold just after starting it runs really ruff, you have to feather the pedal. i dont know about sensors,could those be an issue. im open to suggestion.