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Bad High Speed Miss

A

Alucard226

NAXJA Forum User
Location
North Carolina
I've got a '90 laredo 4.0 renix that has a horrible miss between 55-70 mph at light throttle application. I've cleaned the tps up, redid all the vacuum lines & egr vacuums except the egr selenoid it tests bad so i put one out of a family members 89 laredo that tested good and it didnt fix the miss, changed the plugs and wires cleaned up most of the electrical connections but i just can't seem to get rid of this miss hasta:doh: any suggestions would be greatly appreciated.
 
An 02 sensor failing will do that, they tend to buck right around 2000 RPM and then crap out again around 3500 RPM.
What happens is the 02 sensor runs the motor a little too lean under certain vacuum, throttle and timing combinations. Usually hits right around 2000-2400 RPM the worst.
 
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