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Old 08-17-2011
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I am: Jeff R
Join Date: Aug 2006
Location: Lakewood, CO
Vehicle: 1994 Mazda B3000
Posts: 22
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Very intermittent stalling

About 2 years ago, I had two occasions of stalling at highway speeds. Truck would start bucking harder and harder until it quit completely after 10-20 seconds. After letting it sit for 5-10 minutes, it started up and ran just fine. About a month later, the exact problem happened again. I couldn't pull any codes, didn't see anything noticeably wrong, so I just chalked it up to bad gas or temporary gremlins.

Present day:
Same issue happened about a month ago, then a second time a few weeks later, same result both times. Then today, it happened again, but after restarting, the truck would only run for about 30 seconds before dying again. This happened 3 times in a row and then I was finally able to make it the 15 minutes home without further incident.

I did the easy fix after the first time today and replaced the fuel pump relay without success. Fuel filter is only 2-3 months old, so I don't think it's that. Never have a problem with starting. I use good gas (or fuel additive/cleaner) every so often. Wondering if I should look at replacing the fuel pump, or if there's other things I can check before going through the hassle of the hard fixes like that.

The weird part of the problem is its intermittancy, and I'm wondering if that may be a clue to its cause? Anybody have any ideas?

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Old 08-18-2011
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I am: Victor C
Join Date: Dec 2008
Location: Toronto, Ontario, Canada
Vehicle: '03 Ford Ranger
Posts: 174
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This may be a shot in the dark, but a thought that came to mind is that you may want to check out your cats and see if they're clogged and running "hot".
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