The exhaust has a rattle noise to it, it's gradually started to run worst and worst. We e had it looked at by a few people. We found that there is a pretty main vacuum line plugged off with a screw. From the intake, the one that's on there is a shitty universal one. 'spectre' we then had it looked at again and found there was a wire hanging. We were told it's the o2 sensor. There was oil on the engine so when I washed it I also sprayed that down ever since. Then it's started tO sputter and hesitate when you it the gas pedal. It sounds terrible and is running like crap. We also found that there is no catalac converter, and the exhaust and headers are real rusty & old lOoking. Help!!!!