2001 Chevy s10 2.2 liter you have a very bad tapping noise after warm up at idle speed and goes away when you give it some gas what could this be.oil level is good?
Check oil level
Check oil pressure with a mechanical gauge Improper oil pressure
going to hydraulic lifters and/or engine sludge causing blockage of
oil flow to lifters. Get an engine flush and oil change and see if
that helps, if it doesn't get the truck to a mechanic as the
problem maybe much more serious.