Small issue with my 1hdft. At low speeds, usually 60kmh or less when the engine is at low revs and maybe under a little pressure, the revs start to move about. Seems to happen around 1500 rpm and it will bounce up and down by about 50 or maybe 100 revs. If I ease off on the gas or give it more welly, it disappears and in all other driving conditions the problem doesn't show. Car starts instantly, ticks over perfectly and no real smoke from it, so wondered if anyone had a similar issue. It was parked up for 12 years but has had a few 1000 km's done since I restored it. I've changed out the primer pump and housing as that was drawing air and all the fuel and air lines look good. Its an auto if that makes any difference