*HELP* 4.9 with miss and bad MPG'S
Got a 1991 Ford F150 with the 4.9 300I6, behind it a 4 speed manual and 4x4! ONLY GETTING MAYBE 9MPG!
I just bought it from a guy and he said it was sitting for 1.5 years.. But it fired right up!
I ran it out of gas on way home (gauges didn't work) and ever since that Its had a miss at low rpms and idle.. but if I throw pedal down she runs like a champ..
I already did full tune up (plugs,wires,cap,rotor,air filter) ALSO ran seafoam and 91 octane..
Had guys tell me timing could be off, fuel filter is clogged, intake or coolant sensors, o2 sensors....
All it has for exhaust is the 2 cats.. no pipe after, it has a manifold leak also..
What could cause this? Any opinions welcome!