I Might Just Know What I'm Talking About
Join Date: May 2002
Location: Selma,CA in the middle of the vineyards, Central California
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Idle problem and miss/stumble/stall at altitude
1990 K-1500 Z-71, 350 cid, 700r auto, California Emissions
Rebuilt motor by local shop (known as a good one)
New distributor, coil, plugs, wires, fuel & air filters, 02 sensor,
Rough idle, seems to be "hunting", almost like a big cam at low idle. Starts fine and seems to be ok while on 'fast idle, warm up' but goes to heck after warmed up.
at approx 5000 elevation it has a miss/stumble/stall.
I live at 7000 ft and the problem occurs everytime at nearly the same location on the drive home from the valley (150 ft elev, 90 mile trip). The problem goes away after a few miles/minutes.
Three mechanics have looked at this, scratched their heads and don't want any more to do with it. (speed shop, smog station, tune up shop) All seem to think the computer needed to 're-learn' and to drive it awhile and see what happens. Some improvement but not much.
Need this cured because it Smog test time, actually overdue!
Thanks for any help, thoughts, suggestions. Or any other BBD's to post on?