Hi guys. First time on the site, hope I can get some help. I have a 1990 camry on dual fuel that has done 198,000 kms. Recently it started running rough, in fact it was so bad on gas that we can now only use it on petrol. It shakes when idling in drive but is ok in park. It has very poor take off and no acceleration and the engine seems to miss a beat causing the car to shudder until it reaches about 3000 rpmand then it runs ok.