My car starts and runs great when it is cold. Once it start to warm up the idle will become erratic, it will sputter for thirty seconds or so then rev up to about 1500 rpm's then it levels out at about 950 rpm's, which seems high, this is when the car is in park or neutral. When it is in gear it will do the same, only if I turn the wheel a bit it, the sputtering becomes worse and the car will stall. I have replaced the IACV, TPS, and the coolant sensor. I also have a new catalytic converter. I have searched many times for vacuum leaks, but have found none. The car also has a hesitation when going down the road and seems to become flat at times, only to take off like a rocket. I seems to be using a lot of fuel and the gas mileage is down. The check engine light is on. I am confused at this point! Do you think I may just need a tuneup? The gas filter is new and the air filter is also new.
Apr 14, 2016 at 4:42 PM
