dracon79 Posted February 28, 2009 Share Posted February 28, 2009 I have a 88 comanche 4.0l 5 speed. When I get around 2000 rpms the engine wants to stumble specially on the freeway in 5th gear once I get between 60-65 it wants to stumble pretty good but if I go under 60 its fine or over 65. Need help... :hmm: Link to comment Share on other sites More sharing options...
MiNi Beast Posted February 28, 2009 Share Posted February 28, 2009 fuel pump? Pressure? CPS? Link to comment Share on other sites More sharing options...
oldrusty Posted February 28, 2009 Share Posted February 28, 2009 Mine was stumbling but only under a load like when your trying to pull a hill in 5th gear. As soon as you downshifted and brought the rpms up it ran fine. Wound up being a bad tps. I tried to adjust it but couldnt get the correct output voltage. Runs great again with a new one. Link to comment Share on other sites More sharing options...
dracon79 Posted February 28, 2009 Author Share Posted February 28, 2009 Well about a year ago or so I changed out the fuel pump with a shucks carter pump and I just checked the fuel pressure at idle and it is only 25 psi. umm I don't think that is good. :hmm: Link to comment Share on other sites More sharing options...
tugalo Posted March 1, 2009 Share Posted March 1, 2009 My 88 stumbled badly around 1800RPM under light load. Ended up changing the coolant temp sensor and the Manifold air temp sensor. I also removed and cleaned ALL grounds, added a ground cable from the neg side of the battery to the front clip, and replaced the ground strap with a HEAVY battery cable from wally world. works good...... Link to comment Share on other sites More sharing options...
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