I have a 1990 GS with 5 speed and 196K on the vehicle. My vehicle hesitates or misses when cruising down the road. It does not miss or hesitate under acceleration, just seems to do it when going at a steady rate. Ocassionally, starting out from a dead stop, the car seems to bog down (a split second of lag time) and then accelerate fine. I have replaced plugs, cap, and rotor and tested plug wires. This has a made a minor improvement in performance but has not effected the problem. I intend to clean the IACV as I saw posted on this site and also replace the Vacuum hoses but can’t seem to find the hose size or sizes. Can you tell me the vacuum hose diameter’s are and/or any recommendations concerning the performance problem? Do the IACV cleaning and new vacuum hoses sound like a good idea or a waste of time?
Thanks for your time, Pat