You own a 1991 Infinite G20 with 190k miles and it shakes in idle and occasionaly dies There is blue smoke coming from the tail pipes and the RPM meter is shaky What causes this problem?
i have a infinti I30 and my rpm mater was shaky. i checked the cables running to the tranny and they were loose i tighted them up and it was fine. also my brother also has an I30 with the rpm staying between 1500-2000rpms and it was his idle air control valve. the smoke could be lots of things a headgasket,valve stems, piston rings,or even the egr valve. that i would get checked out at a Nissan dealer(same thing as inifinti but cheaper).