2003 Nissan Altima Not allways cold Engine vibration like r

2003 NISSAN ALTIMA
100,000 MILES • 4 CYL • FWD • AUTOMATIC
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WINLEXY
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Engine light come on but goes away after either after shut off or acceleration.
also happend when engine was cold, warm but not at operation temp.

visible enging shake / vibration on idle
feehls like running on uneven cylinders

generaly with acceleration stops the problem.

the Crank shaft sensor was replaced @ ~80000 m.
This is adifferend problem as the car would not trun on even when @ operation temp.
Oct 23, 2010 at 10:42 AM
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WINLEXY
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Then Engine Light code is P0301 - Cylinder 1 Misfire Detected - Cylinder 1 Missfire.

Initial Resolution:

Changed Air Filter $14
Added seafoam S11
To the oil change ( Semi Syntetic Castrol High milage) and gas tank to clean Oil and Fuel reladed components.

Problem has not reocurred.

Will change spark plugs ( Platinum 2 for $10) @ 100000 mils to elimiate one electrica componend.

Try those resolution first before following the Nissan Help sugestions of Replacing more COSTLY PARTS!
https://www.2carpros.com/trouble_codes/obd2

Please post if similar resolutions have resolved the P030x Fameily of error codes Cylinders missfire !!commenly known as engine shake or vibrations @ idel or loss of power during acceleratrion, slow or no "stuck" responce from accelerator.!!
Hope this helps some one to save money and frustration incured by the non trustworthy Blanket replacment policies of Name Brand Car Dealers in general.
Oct 27, 2010 at 2:04 PM