Car maintenance question?

I have a 2004 jeep liberty that will not idle or start on it's own unless I rev the engine for 20 minutes. Pep boys charged me 89 for an engine inspection and I'll be damned if I let them charge me 589 for the full maintenance. They say I need to do a fuel system clean up, like my fuel injectors but I wonder if I can get by with just the fuel injector cleaning fluid. Also they say my idle speed control motor needs to be replaced which I'm sure I can do myself.

Thoughts?

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gregloa · 61-69, M

So after the engine warms up it idles ok? And runs ok?

CuddleFeesh · 31-35, M

@gregloa yup. Totally. Nothing else happens

gregloa · 61-69, M

@CuddleFeesh sounds like the coolant temperature sensor. If it is not working it can’t tell the computer that the engine isn't warmed up yet. Thus the computer can’t control the correct cold air fuel mixture until it warms up. Which is why it will idle and runs ok after it warms up.