I have a 90 iroc z 5.0 tpi. Recently has been stalling out. I changed out the tps and the idle control valve. My rpms have decreased since I changed it out. I have the self adjusting tps so I can’t adjust it. It turns on fine but sometimes I put it in reverse and just dies. Or when I’m about to get to a stop my rpms go below 500 then resumes and wants to stall. I checked for codes and it threw a 22. Could it possibly be a vacuum leak? The tps I installed on it was from auto zone. So what ived read these Camaros can be picky with the tps. So I ordered a tps from ac delco brand.