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Leave the stock fpr, the aftermarket ones are notorious for causing issues and failing. What tps code and vss code? Post the numbers. Sometimes you have to slot the tps mounting holes so you can calibrate it for the throttle body. Most seem to agree .67 with the throttle body closed is right and 4.5 volts all the way open gives you WOT (Might be just 4 volts). Any old fuel filter will work in my opinion, I just use a wix piece. Really if you want to keep your air/fuel ratio in check, you should install a wideband o2 sensor and gauge.
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