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1997 Mazda b4000 runs smooth then starts skipping and jerking. what would cause this?

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In drive...set brake ...shift to Drive and hold car with brakes and run engine up to 2500...(no more that a few seconds) . What you are doing is bringing engine to full load where you are most able to duplicate your concern while setting still...This load also puts full demand on your ignition system where you may be able to find a cracked plug, bad wire or other componenets with the ignition system. Ive even went a step further and veiwed all the ignition system components in total darkness where you may be even able to get a visual on a misfiring cylinder due to faulty ignition components...cracking porcelin on spark plugs during installation is not uncommon at all. If you are unable to duplucate or find any problems within the ignition system,jump over to fuel delivery and start by checkng that plugged filter then fuel pressure,etc...good luck and be safe power-braking engine.use chalks or curb to assist holding tight
..never run engine in the red or hot..

Posted on Dec 18, 2016

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Clogged fuel filter. Clogged air intake. Bad coil. I tend to go for cheapest cost first on old vehicles. But would do a compression test on this one.

Posted on Dec 18, 2016

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