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Random engine misfi...
 
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Random engine misfire

  

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Hey scotty, I've got a 1999 toyota 4runner 3.4L, automatic trans. 152k miles. Recent Check engine light. Running Codes p0300,p0301,p0302. The only time I notice an issue is on highway especially going up long hills or inclines. When I press gas to accelerate, it has trouble maintaining speed and you can feel the engine miss intermittently and check engine light blinks. Doesn't rough idle, great going around town. Only issue is on highway. 

Can you pinpoint what it may be?

Thanks, Andy


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