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Check your TPS and O2 sensors. Could be a bad thermostat. My 94 did that ,changed it and solved problem.

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โˆ™ 2008-10-13 23:22:26
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Q: 94 Toyota truck with 22r 4 cylinder had the muffler changed today and they said it was running rich it seems as it is running sluggish with the accelerator half way down could it be bad injector?
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