i have 1985 ford f50 ext. cab with a 5.0l fuel inected. it has been in the shop since before thanksgiving and the mechanic is not sure how to fix it any thoughts would be great.it had been sitting up for about 3 years before i bought and have been driving the truck for about 18 months the mieage shows 80000 which is supposed to be actual miles.
my son had been driving it for about 3 months and the truck always had a slight miss when you drive it. this may not be part of the problem but in the middle of october circuit city installed a new stereo in the truck and afterwards we took it out 3 times to add speakers and wires for a subwoofer. about 3 weeks after this the truck started to crank slowly like the battery was dead.
then on the thursday before thankgiving the truck died on my son and we could not get it started. i had aaa tow it to the local mechanic. he said the fule pump was not working. i figured it was out of gas since the gauges do not work on the truck ( dual tanks ) after putting in 10 gallons of gas and a new battery it still would not crank. the mechanic replaced the fuel filter on the frame, the modulator and pickup coil. my son drive it 15 miles and we had trouble staring it again. sounded like it was not getting enough gas. when it did start it ran really rough and blew out alot of smoke from the tailpipe. i drove it almost all the way back home and it finally died going around a corner. aaa towed it back to the mechanic shop. they said that the truck now has a new set of problems. there thoughts are that 3 of the injectors are not firing. it gets spark leaving to the injector but no spark arrives. i would think changing out thge wiring harness. but that is probally not a practical solution. it does start but idles very rough. and the mechanic calls the three cyls. as dead. he has called other shops and the ford house but they have no idea either. couple other things that should be noted. when the aaa driver was loading the truck gas was coming out of the top of the gas tank and the heater coil maybe going out because i noticed water on the passenger side floor mat and my son said that it got really smokey inside the cab the last time he drove it.