What could cause this? In the mornings it starts really rough but then runs and drives great ? The temp is about 70 degrees when it starts , and starts rough when the engine is cold

 

Is this really outside temp dependent?

Meaning - car has sat for 5+ hours and it is 50 outside = bad start. The sat for 5= hours and it is 70 outside and it starts fine? If so I would test the main relay....yes they can fail the "other way".....and then test the ect, two wire sensor under the dist.

If the car sat for 5+ hours at 50 or 70 outside temp and the same thing happens then I'd go down a different testing procedure.

 

what about a bad ect?

 

Isn't that what I already suggested to test?

 

Okay thanks guys , imma test that ect and I have a new main relay in it , I got it at oreally though haha. The no start also happens when the vehicle is not in use like 3 days or a week