85 Toyota-stumble @ crusing speed

Justshootme84

I'm looking for help with a problem on a 1985 Toyota 4Wd pick-up. The carb has been replaced with a new unit recently to fix a poor idle and rich condition. The engine now has good idle, runs smooth and has good power when accelerating. But on a long trip, say 100 miles and the engine warmed up, it has a slight stumble or sputter when cruising at 50-60 mph. Any suggestions on what to check would be appreciated!!! My first suspect is the distributor, and perhaps the vacuum advance. JSM84

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1984 Bronco XLT, 460, C6, NP205, 1-ton axles, S&W Racecars 10-pt rollcage, PRP racing seats, Custom "Shaker" hood
1978 Bronco Custom, 351M, NP435
1986 Bronco Custom, 300 I-6, NP435
1988 Bronco Custom, 302 EFI, parting out
1988 F-350 XLT, 460 EFI, C6, donor truck
1998 Chevy Z-71, 350 Vortec, for sale
2006 Dodge 4WD 1500 QuadCab, 5.7L Hemi
1979 F-150 ranger 4WD, 351M, C6, for sale

Justshootme84

Just to update:

May have solved the problem. Loose spark plugs. Did a tune-up recently, tried the Bosch Platinum plugs. When removing the old ones, found a couple that were very loose. The Toyota didn't like the Bosch's, ran terrible, so switched back to the same Champion plugs. Engine runs great now, no stumble!!! JSM84

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1984 Bronco XLT, 460, C6, NP205, 1-ton axles, S&W Racecars 10-pt rollcage, PRP racing seats, Custom "Shaker" hood
1978 Bronco Custom, 351M, NP435
1986 Bronco Custom, 300 I-6, NP435
1988 Bronco Custom, 302 EFI, parting out
1988 F-350 XLT, 460 EFI, C6, donor truck
1998 Chevy Z-71, 350 Vortec, for sale
2006 Dodge 4WD 1500 QuadCab, 5.7L Hemi
1979 F-150 ranger 4WD, 351M, C6, for sale

mnmstoy

cool
Had that happen to me back when I bought my first Nova(1989). A mechanic said that I needed a rebuild. Lucky, my older brother talked me out of that and he looked at it. Found out that all the plugs were loose. He gave it a tune-up and ran great for two years before I sold it. Needles to say, that Mechanic is now out of business.
Mike

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Mike
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1980 Toyota 4.3/465/300 on Propane.
60/14 welded front, detroit rear 5.13 gears.
39.5 IROC on H1's