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  1. S

    1999 engine pulsation / power loss @ speed

    Thanks Majisto! Do you think clogged Cat would also give me the code for bad O2 sensors?...if so, maybe clogged cat is main problem ?!?...causing computer to adjust..??? Scrappy :us:
  2. S

    1999 engine pulsation / power loss @ speed

    99 4.0 ltr SOHC...just bought from used car lot. Check engine light on and engine pulsates/looses power after 45 minutes of driving. At 50 -70 MPH it gets bad. Wife driving it once and couldn't go faster than 40 MPH and "check engine" light was FLASHING (not good right??). Had code scanned @...
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