Question about 1999 Toyota Tacoma PreRunner

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Main cause of low speed sputtering, especially when cold.

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If it is sputtering after warm up and you have ruled out fouled plugs, You could be looking at an E.G.R valve that is stuck open.
If you have a big loss of power, and your air filter' is clean, check the fuel pressure at the fuel injection rail (there is a fitting on the rail just for this purpose) and see that it is not at or within five psi of the lowest allowable pressure. (your local auto parts store can look this up for you) . If the fuel pressure is good, you may a small crack in one of the coils.

Posted on Mar 29, 2015

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.... Robert Grove
johnallen496, when you say it stalls at low speeds and stops, do you mean when slowing down and coming to a stop? does it stall at low speeds while the car is moving with your foot on the pedal just a little like when driving through a parking lot?...

I used the wrong box above, oh well ....

The most common cause of stalling at low speeds, especially idling and decelerating to a stop is carbon buildup. The throttle plates get coated with carbon closing down the opening slightly, this affects the idle speed, causing the engine to stall at idle and coming to a stop.

also carbon builds up in the cylinders and absorbs fuel intended to be burnt, leaning out the mixture and causing rough/low idle and stalling - especially when the engine is cold. Dirty injectors can cause the same symptoms/results

As a maintenance routine It's good to have the throttle plates cleaned and perform a top engine de-carbon treatment, and fuel injection service in more severe cases

Sea Foam makes a spray that works great for minor de-carbon service, just spay it into the throttle plates while it is running, one to two cans will do, add a can of Sea Foam or Techron to the gas tank each time you fill up for the next few tank full's.

If you still have problems sek out a qualified professional

Good luck!

Robert Grove, WEGO2U Mobile Mechanics
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