I just swapped a 96 4.3 into my tracker, the engine runs good at idle but is running extremely rich, scan tool says over voltage on the map sensor. I replaced the sensor and its doing the same thing. I know the sensor reads pressure in the manifold and tells the computer the proper fuel delivery. Could it be a vacuum leak? has anyone had this problem before. it misfires as well. When i first got the engine 2 injector nozzles were clogged so I soaked them in fuel injection cleaner. I had the injector module hooked up and watched all 6 nozzles spray, I dont think I damaged any of them.