When I leave work and get stuck at the first red light I notice the car has a small vibration/hesitation for a split second.The rpm gauge stays rock solid and does not move but I can barely notice the vibration for a split second every 10-15 secs intervals until I resume driving. It does not do it again till the next day again.

Anyone? anyone anyone?

 

how cold? what year truck? any smoke?

 

About 8 hours parked outside in 90 degree weather.

 

well then it ain't your grid heater now is it