My jeep has had a small popping sound out of the exhaust when i cold start it, it also has a 'now and then' stumble /surge around 1500-3000rpm, the stumble is big enough where i can hear the engine rattle on a few occasions.
Any ideas? I'm thinking it could be as simple as bad gas, or we've been having weird weather in the NE, maybe the weather is tricking the cpu to lean out because it's 50 degrees, then it's running to lean the next morning when its 25 degrees? This started overnight, and has not been going on long.
Thanks for all help!