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Btw, the mechanic who did the tune up guessed it might be a fuel injector issue (he was independent, and did not have jeep program to diagnose via computer). Hoping this is not the case.. I am wondering if the ignition coil packs or battery could be to blame? Thoughts?

I have a 2004 3.7L jeep liberty and when I start it the first time it's fine but when I get the car warmed up, go somewhere and park for a few minutes, and then try to start it again it sputters and wants to turn off and sometimes it doesn't start. I just changed the spark plugs but am still...