My boyfriend has a 1990 Chevy Camaro, that has a suped up 5.0 V8 engine, and it is a manual. He has had it in the shop every week, and now they saythat the starter is only getting 6 volts to it, when it messes up. The car has been in the shop for a week and started up fine the first few days and did not die, then one day decided not to run right and this is when they think they found the problem. But they do not know how to fix it considering they only know what is going wrong when the car is having a "bad day." Do you have any idea how to fix this?