thanks for the email. to clarify at present my car between 1000 revs and up is finding really hard to drive itself,specially going up a hill in 2nd gear it juders as im driving it almost like it is a kangaroo, it doesnt feel like its coming from the engine more like a sensor? throttle? a mechanic did suggest it could be the crank shaft sensor? the delay in any type of reaction due to the hiccuping is worrying as i have a small baby and dont want it to break down. The first time it happened the car actually stopped and wouldnt go an a main road. Since then they have changed the engine checked air flow metres, distibutors, leads plugs and put the computer into learn mode all of which hasnt helped. its back in the garage for the 6th time, if you can help i will be bloody happy!!
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First make sure all battery connections to the alternator, starter motor/voltage regulator are clean and tight.
Make sure the ground strap is tight. That's a connection that goes from the engine block to the frame of the car.
If they if all connections are good, then you probably have a faulty alternator and or voltage regulator. On newer cars like yours the two are connected to each other and bought together as one assembly.
Look for restrictions in the intake air and exhaust systems. Check fuel pressure and delivery (fuel filter/pump). Check the ignition system as well. If the engine has a lot of miles, you may be experiencing combustion seal wear. These are amazing engines when they work correctly! Good luck!