My car has a really hard time starting. Its a 350 TPI. It has a really hard time starting. It cranks for 5 or more sec's. The tps is set to spec. I replaced the coolant temp senor, Fuel pump relay. Could it be the the air fuel mixtuer??When the car is cold it stumbles untill it reaches a little of 100 degress. Could it be a bad MAF? I should test the fuel pump. I do hear it prime when I turn the key. Any ideas.

 

Sounds like an inop cold start injector, aka 9th injector...