Matthew About your engine surging: I had similar problems on my 2.1 Digijet. Like mine, maybe your system is also feeding excess air past your throttle body which means one or both of 2 things are faulty: 1) Idling control unit (behind right tail-light cluster 2) idle valve (sits right on top of engine). Try removing your control unit. You may have to adjust your idle screw to keep the engine going: bring it to just over 1K rpm at hot idle. Now ride around for a few days and check whether you are still surging. This worked wonderfully for me, even with air-con! FYI, the control unit controls the idle valve which allows air past the throttle body to keep the engine from cutting out under load, ie. air-con, power steering. A fluctuating idle means that the valve opening is fluctuating. Good luck! Nigel Cape Town, SA 89/90 caravelle syncro
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