lol, so they wouldn't tell you waht the problem was really, but they would fix it for 600$ eh? Really does sound like the battery or alternator. If it were the TPS out of range it would throw a code. Fuel Pump also has a relay in with it. What year is it?
__________________
"Genuine" ASE certified Mazda, Hyundai, Isuzu Technician
Escort Enthusiast Site
Automotive Electrical Specialist, Tuning Specialist