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If you remember a couple of months ago, I was installing some crappy headers and was asking for advice on installation. Well, I took the advice, sent the crappy headers back, and got a replacement manifold from the local yard. Simply Lovely. Only problem is, the car has an intermittent misfire in higher gears that causes the car to lose power on the freeway. The misfire only seems to happen at higher speeds and is not limited to one cylinder as far as I can tell. My baby was sitting out in the weather for a couple of months without running, so I'm assuming she's just got a cold. I've already tried putting some injector cleaner in the tank, but haven't changed the fuel filter yet. Beyond those two things, do y'all have any suggestions?
:peace
 

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Open the hood on a dark night and see if any of your spark plugs are arcing.

How long has it been since you've replaced the distributor rotor/cap, plug wires, plugs?
 
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