2.9L cutting out at speed

[welton]

I have a '92 ranger w/ 2.9L it has a slight miss at idle, but cuts out badly when driving. I replaced plugs,wires, distributor cap and button, fuel and air filters but no help, then I noticed that my coil seems to be "SPARKING" or grounding out, (you can only see this at night). I replaced the coil but the problem must be elsewhere. Does anyone know what the fuel pressure should be? and the vacuum should be? I'm getting 17LBS vacuum. Anyone have any Ideas? Thanks

 

[cocoasranger]

If it gets worse the faster you try to go you ought to check when the fuel filter was last changed.

 

[IMenriched]

agreed... you could of gotten a bad tank of gas and replugged the filter.

could be the pump is hinting of last days too....what kind of pressure are you getting?

could be a bad ground ??
could be a vacuum leak still...http://www.therangerstation.com/Magazine/Summer2003/VacuumLeaks.htm
17lbs seems pretty good though.

how is your exhaust, could be a cat getting plugged or muffler??

 

[jvs8864]

sounds like my problem....

im thinkin its the fuel pump