I recently bought an 82 Trans AM with 65,000 original miles. It's been siting in a garage for a couple of years. I had the gas tank replaced, new fuel pump and fuel sending unit. It starts fine, but idles and runs terrible. I'm thinking possible clogged injectors but not sure. Any ideas?

 

same with my car.. new tank, new pump new filter, same issue

 

could be stuck injector,stuck or out of sync IAC valve,vacume line off leakey lid gasket or a couple other things...Also remove and reinsert all the fuses-they often get a bad connection from being undisturbed for decades...