I have a 1995 motorhome with a Chevrolet 454 tbi. It was running fine one day and the next it would start then stalls immediately after. Replaced the fuel pump, filter, map sensor, engine temperature sensor, water temperature sensor, coil and the sensor at the base of the distributor. If I disconnect the vacuum line from the brand new ac delco map sensor it will start and run but not very well. Was told I needed a new tbi system but $500 is a lot of money for me to spend just to find out it wasn't the problem after all. At the end of my rope and need guidance desperately. Thanks in advance.
