runnin rough - please help

Have a 93 chev sub. w/350 v8. Has been running rough last 2 days at 1500 - 2500 rpms under above average acceleration. Will do it whether stopped holding brake or regular driving. does not do it in park or neutral. Does seem to get more noticeable when engine gets to normal running temp. I'm at a loss. :banghead: Any help is appreciated.

Thanks

Do you have any codes? Check code with cheap code puller and see if you have any codes related to rich or lean condition. Possible that ECM temp sensor (on top of manifold, by t-stat housing--has two wires coming out of it) might be going bad. New one costs about 11 bucks. See if you have codes first before changing anything. Not a mechanic, just a sometimes frustrated 89 Sub owner!

Time for a tune up?

thanks for the help!