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Lean...

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Or timing ?

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These 2 guys are right, it's the tune up, I'd bet a weeks pay on it.

You don't need to modifiy the cooling system, you need to run the right tuneup, I'm sure.

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Challenger 1 - Will you be sending that weeks pay via Paypal or check???...

Well, regardless that the radiator was new, and no matter that we flushed the cooling system - apparently the 1,000 mile trip to MMW in St.Louis knocked enough rust and debris loose in the engine/cooling system that the radiator was plugged up. After trying EVERYTHING else, I took the radiator back to the shop and told them my problem and they said they would flow check it. Yep, sure enough - they said even though it was cooling, the flow was terrible. A $21 radiator flush and I'm back in business!
WHAT a lesson learned!
Thanks for ALL the help and ideas you guys gave me (and all of us here on Moparts), I think this will be a valuable thread!

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