Question about 1991 Toyota MR2

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90 mk2 mr2, recent engine fitted from rev 3 37,000 miles. was going up hill, normal speed and it became reallt sluggish on me, had to down shift to 4th and it died in 4th and 3rd then 2nd, replaced plugs, checked oil and coolant, everything is fine, no leaks but engine heavily shakes under idle like a cylinder is not firing?? but there is no backfire or smoke??

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Fuel pump? fuel filter? clogged cat? clogged injectors? dirty cap?  dead rotor?  is spark wiring correct? timing right? no idea.  good luck.

Posted on May 18, 2009

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