heavy heavy vibrating, like a muscle car, mechanic said that there may be a short in the wiring harness leading to the 2nd injector, how would I trouble shoot this problem, figured follow the wiring from harness, this may be an ecu problem as well. not sure. helpcar sounds like a deisel engine upon idle

 

Is the check engine light on? If so, check to see what code might be present.

When's the last time you changed or checked your oil level?

A defective timing chain tensioner can cause excessive chain slack which sounds horrable as well.

 

could this be a result having too much oil, will get an oil change tomorrow to isolate that problem. the codes are knock sensor, and intake air temp malfunction, i am running a short ram intake so the intake code has been present. may try changing the knock sensor.