x5carl3tMurd3rx
Well-Known Member
so last wednesday when I went to my dentist appt I had to stop and get gas. barely made it to the gas station since I was so low on gas and when I got there they were outta 93. since I was already late and wasn't going to be able to make it to another gas station (closest one was 10 miles in the opposite direction of my dentist) I put 2 gallons of 89 in the car. babied it all the way to my dentist appt keeping it out of boost cause I was worried about detonation with the lower octane. after my appt I filled it up with 93 and babied it for another 60 miles or so to make sure it had a chance to burn up all the 89 that was in the fuel lines still. since then its been stumbling and breaking up real bad at about 3500rpm. I'm not sure if it just happens to be a coincidence that it happened right after having to put the 89 in it or if that was the cause. The only other weird thing is it only seems to do it when the car has heated up. When I got up this morning and drove it, it was fine. I could do WOT pulls all the way to redline without and sign of hesitation. then about 5-10 miles down the road as I was pulling away from a stop sign it started stumbling again. I filled the tank again with 93 and put a bottle of valvoline complete fuel system cleaner in it. Once it cools down I'm going to go pull the spark plugs and check them all. any other suggestions as to what it could be? I'm also going to get in touch with my tuner and speak with him about it possibly being a tuning issue.