power loss

[jarfly]

Got a 89 ranger 2.9/ aiu
to that is loosening power after it gets warmed up, you have to keep it full throttle to run 55, and wont rev past 3k
I can shut truck off and let set for a bit, it starts easy and will rev past 3K.
then will loose power after 10-15 minints of driving. Allso after it starts doing this, the gauges does not work right, they jump back forth.
Thanks in advance for the hep

 

[adsm08]

Gauges jumping around are an electrical issue. I'd start by running a seconary ground cable betwee the engine and the body. I have used the stud off the top of the RF shock for this with some success. I wouldn't do it as a long term thing, but its ok with a quick and dirty test.