I have a 89 iroc z with stock 350 tpi and vats has been disabled. My problem is that the other day i had it out it started running like crap it would still run but when ever i stepped on the gas it would almost die then all of a sudden it would regain problem. then the next day i drove it probably fifteen minutes and it ran great then stopped at a friends house turned it off. went to leave and it started right up but got around the corner and it died and can't get it to start again. can some one tell me how to test the fuel pump and injectors and tell me what i should be getting for a reading