ive got a 1986 22re 4wd pick up and when i first bought it, it was stock and it got around 22mpg....well i put a comp 260s cam in it and hedman headers, lifted it 3in and put 33x12.50s on it and it still got about 19-20 mpg...for about the past 7months its been geting progresively worst gas milage it went from 20 to 16 to 14 and now i get about 11mpg and i even downsized to 31x10.50s...its go a fresh tune up new tps sensor and a buddy has a junk truck i took the computer off of, o and a new coolant temp sensor....its starting to idle bad in the morning and it feels extremly sluggish...help! i cant afford to drive my pride and joy anymore (my 83 chevy is gettin better milage)

 

Have you checked the timing?

 

i can get #1 tdc and all of my marks line up the one on the cam,crank and i pull the cap off and its pointing at #1...i didnt set my base timing right though when i put a new chain and gears on it (did it when i first got the truck) i cant ever figure out wich terminals im supposed to connect and exactly what im supposed to do after i jump them?

 

also when it is running the exhuast has a strong smell of fuel like its running rich but i pull the spark plugs and they have got an almost white tip like its running lean....this also has me puzled

 

Might be a bad o2 sensor.

 

o2 sensor or maybe bad injector , posssible timing needs adjusted

 

id check the o2 sensor and have the fuel injectors clean.. when i installed a new o2 sensor the fuel milage got a lot better instantly

 

just put a new o2 sensor on it about 3months ago, i pulled it out last night and it lookes ok....i think the timing is off i really dont know how to check it i know you have to jump terminals T and E or something like that to set the base timing but past that i have know idea how to get it right....thanks for all of yalls input!

 

??....any other ideas??

 

after i put a new tps sensor on it ran great for about 30 min and it started doing it all over again.....a friend/shade tree mechanic suggested that mabey something in the electrical system spiked the tps and messed it up...could this have happened?

 

I fell your pain. I'm fighting the same battle with my truck. From reading the FSM I think the TPS is just a reastat. The procedure for testing it is a simply measuring resistance at different possitions. If you think its in the TPS I would check all the connections and look for chaffed or pinched wires.