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Message: <blockquote data-quote="trex92" data-source="post: 395280" data-attributes="member: 4353">What kind of juttering problems you meant? Can give more specific details? Does it happen only during hard acceleration? Any sound emitted from the engine or exhaust pipe? It could be misfiring, when your engine misfires, it happens during acceleration and the car would jerk but this usually happens only when the accelerator is floored and not during gear change. A sound that most people describe as marbles rolling in the exhaust pipe can be heard or some sort of PINGing sound.If this sound is evident in your case, it is a misfiring prob, so check your cables one by one. Could be that the cables are old and are leaking electrical charge. I sent my Putra once to USPD to tackle this prob and bloody hell, they could not even diagnose it. I only found out about my spark plugs cables problem when I opened up the engine cover and heard a pap-pap sound coming from the cables. Then if cables are okay, take out the spark plugs and check them for any sign of wear and tear. They could be too old. Also check the gap between the firing points of the spark plugs to see if they are too big. Too big gaps would cause misfirings too... I think the original spec is something like 0.8mmNow, if there is no sound like i describe, your prob is something deeper. Check this first, have a look at your throttle position sensor (TPS). This sensor is attached to your throttle body (TB). Refer to my picture attached, look for the arrow pointed up (i took this picture from another topic so disregard the other arrows and circle). You would see a black piece of plastic around 5cm in diameter facing you with wires sticking out. This black piece is your TPS. It can actually be adjusted, but do not, i repeat, do not fiddle around with it yet. It is connected to the TB by way of 2 screws at the sides. Look at the 2 screws, and look for marks of white paint. Proton marked the screws with white paint or some sort of paint when the car came out new and original from the factory to indicate that the TPS is set to original factory setting. Look at the paint and see if was tampered with. If the paint on the screws has been tampered with, means someone has changed the TPS setting and it is bad news. Not many workshops can properly adjust the TPS. You have to go for a workshop with MUT testers.</blockquote>

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