Recently, I replaced the altenator in my 94 SSE. Now the alternator is working and the battery is new. If the car sits for more than a few hours, the motor dies if i step on the brake pedal right after the car is started. If I start the car, let it idle for 5 min, then step on the brake, the car runs fine. This problem has not caused the "Service Engine Soon" light to come on. Any idea's as to the cause? Thank you