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GMC Yukon Questions

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Fight if I'm driving it will not let me shift into 4th gear it shaved down into low gear
It just started one day truck was running great and then it felt like I was running out of gas and had to be towed home the check engine light went off once and drove good again and the it started up.but when push gas it sputtered and back fired
I have replace the plug wires the timing cover gasket the front seal the rear seal two coolant lines that were leaking on the number 3 plug on the right side of the motor causing it to fall out replaced at it's ran fine but it's been a week to the day and I have no oil in my truck already
I can press the break a couple of times then it goes to the floor then light comes on....
Im trying to replace the radio (6 cd changer, bose, xm hookup) but when i took it out the panel, powercord seems to not be removable from the radio and feeds into the car. Does anyone know how to replace this type of radio? all the other online forums say it supposed to just come out
During the winter I had heater on low and all of a sudden it turned up to high by itself. I couldn't turn it off for like a week and a half and then it stopped working. I am wondering what the problem might be, I checked the fuses and they were all good.
I have changed the fuel pump, fuel filter, the fuel relay switch, which gets really hot for some reason, changed the EGR valve. I took it into a mechanic and they thought it was a vacuum leak, and they said they checked it all and thought they found one. They called me and said it hasn't stalled and think its fine. Went and picked it up and I wasn't even a block away and it stalled as I was driving, had to pull over(keep in mind still has power, pulled over put in park then started it back up and it started. Drove it home no issues, drove it the next day and same issues..... Tried troubleshooting it myself again, looked at the vacuum diagram and it showed they had the hoses switch for the one going to the fuel tank. So I switched them, drove it for two days and it was fine. Then today it was back to same issues but much worse, just be driving along and rpm drop to 0 then it stalls out and have to pull over, sometimes it will start right back up, but today it just wasn't happening.... Any idea's, thoughts, would be greatly helpful, just don't have the money to take it into a mechanic, pretty good with vehicles and have worked on a few, but this one has me so confused.....
My truck won't take gas. Replaced canister purge valve, solenoid under hood near intake & fuel cap, finally took to shop & they replaced fuel vapor canister & blew out all the lines. Still NOTHING after all of that.
The fuel tank pressure sensor above the gas tank has not been replaced as of yet.
Any input? What good is his "New state of the art diagnostic station"???
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