I have done some of the required research on this forum and even posted the question on another ford forum with no luck. Some posts on this site seem similar, but none to the T and are too old for me to reply to and probably ever get a response. so here is my question, please don't hate me if it has already been answered.
I have a 1992 Bronco with 180k on it. 5.0 E4OD trans. Trans has around 230k on it. It surges sometimes. Sometimes it surges terribly in gear at an idle. Sometimes it surges so much it stalls in gear at idle. Sometimes it stalls immediately after switching gears ie park to reverse, drive to reverse. In Gear at an idle if I power brake it to about 1000rpm's the surging isn't noticeable. Truck has a slight misfire, in park or neutral, once in a blue moon if I leave it running to like warm up, when I go back it has shut off, but not usually. Recently (less than 3k) I have replaced cap rotor button, all 8 wires and plugs. Pulled EGR and cleaned it. Cleaned IAC. Disconnected IAC at idle. Truck shuts right off, so that's good right? Found two vacuum leaks to a device up against the fire wall behind intake mani I am assuming EGR Solenoid.
Fixed them. I found a wire harness back there, not connected to anything. Felt around the device at the back of the manifold and couldn't find a connection the wire went to. I am not throwing any CEL codes. I hooked directed vacuum to EGR, truck ran worse. Fuel Filter has less than 30k on it. Both Throttle plates have been cleaned thoroughly . Only other strange thing, is the high temp hose that connects bottom of EGR Tube to exhaust, blows up every month or so. When that blows up, check engine light is intermittent while driving. This problem is destroying my MPG. Went from about 12 to 8. Truck smells like it is running terribly lean as well. Surging and stalling probably started about 2 weeks ago. High temp hose problem has been for about a year now. Less than a month ago, I had done the wires and what not, and replaced the high temp hose, ran it through NJ Emissions and passed. Any suggestions? please help!
Someone told me to check exhaust pressure through o2 tap. I'm assuming they mean unscrew o2 sensor run the truck and use the o2 whole to check the pressure, but I don't know how to go about checking it or what is good pressure or bad.