1993 240sx KA motor well maintained
Just about a few days ago on the way to see a friend I experienced a rough idle and shaking on the highway, I pulled over on the shoulder and noticed the car was shaking violently and making a loud noise almost like a motorcycle when I hit the gas, it also hesitated and had weak acceleration. The feeling was almost comparable to losing gas. This symptom is on and off, it happened to me yesterday on a long drive (about an hour and a half from Brooklyn to Longisland) It went away after 10 minutes and for the rest of the day the car was fine. I replaced a lot of parts less than a year ago such as; fuel filter, fuel pump, cap and rotor, plugs, wires. One shop near my friend suggested I use premium gas and try some injector cleaner. That didn't work out.
Yesterday when I experienced the issue again in Long island I had brought the car to another mechanic close by. He drove the car with me on the highway and it appeared once we hit about 80mph the symptom started. He checked my injectors, spark plugs and cylinders. At first he said it probably needs a tune up which I already gave the car (wires, plugs, cap and rotor) According to him it is supposedly 3 things, my wires are crap or cap and rotor need changing, which makes no sense because those were just changed less than a year ago. He checked the cap and rotor and it looked pretty clean, minimal build up. I actually changed the wires yesterday with some Bosch because the old wires were ebay junk that I didn't trust (vision motorsports) however the problem still persists.
Someone help me out here as everyone seems to be guessing the issue rather than finding it.
Any feedback appreciated!