so i just bought this truck about 1 month ago. It seemed to be in perfect conditon and with a new motor that has about 52k on it. The frame has 157k. So it all started when i was driving home and it started to over heat. I called the owner and he said that it needed a new temp sensor and that it was in the glove box. So i checked and it was there, I drove home which was about 90 miles and the coolant temp needle was on red half the time. Me being a dummy thinking it was just the sensor, i drove home all the way with out checking the collant level.
So a few days later i bought an ultra guage and right when i conneted it, it gave me a engine code of P0300 which is a random/multi misfire. I could only tell the engine was misfireing at the beginning of a cold start, after that it seem to run fine. By the next day the CEL light popped up. I checked the coolant lever and there was nothing in there. I refilled and checked for leakes and found none. One week from then i changed the spark pulgs and checked the coolant again and it was about 2/3 empty. So the next day i checked my UG and it said i have P0300, P0301, which is a misfire in cylinder #1.
I am suspect that i have a head gasket leak into cylinder #1, that is why i am losing so much coolant, and when i pulled the old spark plug from cylinder #1 it looked as if the prong was corroded.
Any insight would be of much help. Thank you guys for your time.