94 xlt 4x4 4.0 seems sluggish at high rpms and randomly bucks.... and at idle it runs at 700 rpms but smooths out to 900 rpms after about 5 mins... i have codes 99, 81, 57 with a flash scanner

 

anyone?

 

ok now it wont go over 4k rpms in gear and also have koeo codes 157 and 158... wtf??

 

guys... i really need help on this... also the flange to the manifold on the y pipe is rusted gone... would that make a difference?

 

cant help you i dont know anything on OBD 1. Google the codes

 

solved the problem kinda... i fixed the exhaust leak and weirdly it runs alot better but im not sure if its running at top performance cuz ive never driven a ohv... just a ohc

 

Hi ,Check your plugs & wires . IN the old days we called it week ignition . I think you have a distrutitor cap & rotor button . A lot of the time the rotor button tip will burn off or will just have moisture in the cap . My thoughts Bud

 

Hi , Select drive by pushing the gear shift button each time you drive an don't worry you don't need overdrive . Save your money to make your repairs later . You'll burn more gas . My Thoughts Bud

 

its a 5 speed and i just gave it a tune up and its EDIS so no cap and rotor