are your fuel filters good?

you might try a different oil. rotella 15w40 for instance. and maybe a heavier weight in the winter. i would be leery of using 5w50 in an engine that old. i dont think 5w50 is listed for it in the owners manual.

the idle isnt really that low. but there is a device for making it idle higher with the ac on, i believe, maybe that is not working correctly.

good luck

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.