1500 Stalling

From : nacho

Q: detonation. try going to a lower heat range plug if you suspect the misfire is caused by pre-detonation due to too hot of a plug for the current state of air to fuel ratio. neil nelson wrote i think the obd2 3.0 liter mitsubishis are susceptible to carbon caked intake valves causing missfire codes. it might be worthwhile to have the intake removed and the valves and runners walnut shell blasted like iirc was necessary on some of the european imports bmw a few years ago. thanks for the response. i have heard that this was a problem from others. is there any possibility that some additive might fix this problem without removing the intake manifold again. i am surprised that the dealer did not mention this option. i guess they thought we needed a new engine sigh. regards ed white .