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06 kia optima ....engine was shaking...have changed spark plugs, wires and coil pack...engine ran ok till next day....now engine shakes bad...won't get speed over 40. Engine bogs like it is flooded. Checked for vacuum leaks. Also oil in intake manifold ports cylinders 1,3,5, which is the back half of the motor

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Posted on May 08, 2014

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98 f150 missing shaking changed plugs changed throttle positioning sensor still not better. did notice that the coil pack on back side of engine loose could this be the issue


Change spark plug wires, One bad wire can cause it to run rough end mmiss fire.As for the coil pack tighten the bolts up,

Oct 29, 2012 | 1988 Ford F 150

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When i start my 2001 kia optima my car putters. i changed my bad o2 sensors. but not sure what the problem is. and when i drive sometimes it jerks. what could the problem be


The spark and fuel system needs to be inspected.--------- The spark plugs are getting fouled or very loose, can cause sputtering problem.Inspect the spark plugs and coil packs.The spark plugs gets power from coil pack.If the spark plugs are very old and dirty, then it needs to be replaced.--------------- The **** problem also relates to faulty worn out spark plugs or clogged fuel filter or low fuel pressure or problem with ignition coil pack.----------- When coil pack stops giving power to spark plug the car will **** while driving.---------- So very first thing you get tested is spark plugs and ignition coil packs.If they are tested good, but looks very dirty/ worn out, that can also be the reason.----------- But if spark plugs and ignition coil tested ok and cleaned properly, but still same problem, then get fuel pressure tested.If fuel pressure is low, the fuel pump and fuel filter are the cause of problem.----------- ------------------ Also one more thing, " IS there check engine light coming ON dash" ? If yes, then get the car scanned at autozone service center.Its absolutely free to get car scanned at autozone.They do it for no charge.------- In scanning you will get error codes, as per error codes, it will point towards faulty part, causing this sputtering and jerking problem.----------------- But if there is no check engine light ion dash, then get the above mentioned possibilities checked.That will help.Thanks.Helpmech.

Aug 05, 2011 | 2001 Kia Optima

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MY FRIENDS CAR IS SHAKING REALLY BAD AND THE ENGINE LIGHT IS ON. SHE TOOK IT TO AUTO ZONE AND THEY SAID ITS A CYLINDER 1 MISFIRE. SHE ALREADY HAD HER FRIEND CHANGE HER SPARK PLUG WIRES AND IT HELPED FOR A...


it most likely is the coil, but recheck the spark plugs and spark plug wires just in case one of the new wires are touching a hot exhaust manifold..

Feb 06, 2011 | 2005 Kia Optima

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It violently shakes when parked or when stopped with brake applied, doesn't shake when moving though, rpms is like 500rpm constant so between 0 and 1 on the gauge. it also notice at night my lights stay...


If it shakes, it is normally either a bad motor mount (if the car runs fine) or your car is "missing" on one or more cylinders (misfire). The belt will squeal because they stretch with use. That can be solved by replacing the belt or tightening the belt. The squealing sound won't go away until you do one of those two things and is unrelated to the shaking. You PROBABLY are experiencing a very "rough idle" if any of the hoses to the intake (top of the motor) have a hole or crack in them from heat or age. This is common and is the first thing to look for to avoid high repair bills. Bad (worn out) spark plugs or old cracked plug wires can also cause a misfire. You could also have a bad coil pack, but mine has gone 186,000 miles without coil replacement or new plugs or wires and I've only changed the fuel filter once. Another possiblity is a faulty Idle Position Sensor that is not properly regulating the fuel delivery. Normally that would cause an engine light to come on also though and you can have someone at the parts store "read the code" once the engine light comes on.

Apr 09, 2010 | 2003 Kia Spectra

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My check engine light is on and flashing & my car is shaking bad!


sound like you need a tune up the light flashing is a misfire take it to autozone and have the codes read

Jun 11, 2009 | 2001 Nissan Sentra

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