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What are the signs of a bad map? My car is starting to run like crap. It barely idles and stalls evey now and then. The exhaust sounds different also, it kinda pops and sounds like a jet ski. Also if I'm driving and step on the gas it will hesitate really bad until the rpms pick up. It just seems to be running really rich. Could a bad water temp sensor cause this? Any ideas would be help full.