CMFI Puzzle
 

Have a 1995 2wd, with 4.3l v-6, vin w, with CMFI. Quit running, so I replaced the fuel pump. Ran for 6 months. Quit running again. Fuel pressure is 55 psi. Do not want to drop my fuel tank again, but will if I have to. (Maybe fuel pump went bad, again). Or, maybe the CMFI unit is shot. Either one is costly problem. Forgot, I spray starting fluid into the intake manifold and the engine will start right up, run for 10 seconds, and die. Whaz up???

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