Okay so the van was running perfectly fine. The van was running fine until the catalytic converter is clogged. Had them changed went to pick up the vehicle and it wouldn't stay running. Change the spark plugs because they were filed out from the converters being clogged. Ran great for a week, all of a sudden it would kill when you let off the throttle. As long as you was giving a gas Grand perfectly fine no hesitation no mess perfect . nobody can tell me what's wrong try try try cleaning the throttle body now it won't go over 2000 RPMs. Help