I have a 1994 GMC sierra truck which was stalling and sputtering until it just dies. I took it to a mechanic who gave me a estimate as to what the problem could be. I replaced the catalytic converter,02 sensor that was damaged due to a leaking transmission line, and the leaking transmission line. I changed the cap,rotor,wires,spark plugs,changed the oil. It has a new fuel filter.It starts up,has power,but then starts to stall when its been on for about 10-15 minutes..I push on the gas pedal and it stays on,until it dies. any suggestions as to what else I could do?