Hi. I'm new here to the forum. I have a 2003 trailblazer , 4.2, 4x4, ext LT with 128k on it. Not much has been done to the vehicle except oil changes, tires, and air filter changes.
I had the service engine soon light come on about a month ago and I ignored it. Then on Christmas day I put 20 dollars of 93 octane from a gas station that I had never been to before. I drove about 32 miles and parked the truck for 5 hours. then before leaving I went out to warm it up. It started fine and seemed to run fine. I went back in the house and came out 10 minutes later to find the truck had stalled out. I restarted it and started driving. I immdiately could feel it was running rough and misfiring. Then the service engine soon light started flashing. I made it home and parked it. the next day I cleaned the throttle body and changed the plugs, both of which had never been done before. I used autolite double platinum plugs because they didn't have delco's.
OK then I restarted the trailblazer and took it for a drive. The traiblazer is still running rough, and the check engine light came back on and it flashes when I accelerate. I took it to the auto parts store and they checked to see what codes it is throwing and it came back a P0300. I put some sea foam in the gas tank with about 7 gallons of gas, and I drove it about 25 miles and no change. I also plan to check the coil boots today. Is there anything else I can check? Thanks
I had the service engine soon light come on about a month ago and I ignored it. Then on Christmas day I put 20 dollars of 93 octane from a gas station that I had never been to before. I drove about 32 miles and parked the truck for 5 hours. then before leaving I went out to warm it up. It started fine and seemed to run fine. I went back in the house and came out 10 minutes later to find the truck had stalled out. I restarted it and started driving. I immdiately could feel it was running rough and misfiring. Then the service engine soon light started flashing. I made it home and parked it. the next day I cleaned the throttle body and changed the plugs, both of which had never been done before. I used autolite double platinum plugs because they didn't have delco's.
OK then I restarted the trailblazer and took it for a drive. The traiblazer is still running rough, and the check engine light came back on and it flashes when I accelerate. I took it to the auto parts store and they checked to see what codes it is throwing and it came back a P0300. I put some sea foam in the gas tank with about 7 gallons of gas, and I drove it about 25 miles and no change. I also plan to check the coil boots today. Is there anything else I can check? Thanks