Question about 1999 Toyota Tacoma PreRunner
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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Posted on Jan 02, 2017
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Here are the common cause of surges, stalls at stops, slow idle speed, erratic idle, it is in most cases the idle speed control air-bypass valve and/or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving
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