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on my 92 civic LX, 5-speed.....its got 128K and i just changed the timing belt, water pump, and timing belt tensioner last week.....i'm ready to do a tuneup and get that great gas mileage and performance.....what are all the parts i should change in the tuneup so i could get the most MPG...and where could i get them??

 
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Replace the fuel filter.
Change the spark plugs. Also look at the spark plug wires new set of high-quality wires is worth the cost. They may be permanently attached to the distributor cap, so it will have to be changed as well.
Replace the distributor cap and rotor
Adjust the valves. Be sure to replace the valve-cover gasket as well, especially if you see oil on top of your engine.
Check the belts. Replace if worn.
Check the fluids under the hood and replenish as necessary.
Change the oil and oil filter.
Replace the air filter.
Adjust the clutch.
Service the battery, adding distilled water (if required), cleaning terminals and cable ends.
Replace the PCV (positive crankcase ventilation) valve. It can make your car run rough or stall if it gets clogged, and it's cheap and easy to replace..... good luck man