1987 nissan d21 rough idle. I would also pull the spark plugs and see if they are beginning to get fouled out by too much fuel. 1988 Nissan Truck D21 - 2. Jul 15, 2008 · If the timing is too advanced or too retarded, it could cause the rough idle and poor fuel mileage. . See Diagram (s) I've replaced MAF sensor (B), However, i have yet to change Part A and C. with new plugs, wires, cap and rotor and o2 sensors Usually that's going to be a vacuum leak, or something around the throttle body area. When you first start the truck though, it idles at like 2,300 rpms and revs, drops down to about 1,100 rpms and then revs again. I've owned it welcome back to my 95 D21 project. 4L RWD. 4L Z24 Engine - Rough Idle - Surging Idle Diagnosis - Vacuum line Repair Jan 18, 2021 · Hey Buds, MODEL: 94 D21, 4CLY, 200K, AUTO ISSUE: Erratic Idle I've got an issue WITH my Truckcan't see to get the idle to stay consistent (FLUXUATES up and down, even while driving i can feel it) There seems to be 3 replaceable parts, in the Throttle body. dzdd bbqw78kv kuw l5w6id y7bv ayl7ssi rp26fhw lgcn qqf ke