Fourrunner
SILVER Star
Well...tried just about everything. Recently replaced just about every common thing that might affect idle that I can think of and still seem to have rough idle at cold and hot startup. I have replaced the cap, rotor, wires, plugs, had the carb rebuilt by Jim and even through a vacuum gauge on it tonight. Last week i set the timing and checked valves to make sure everything was ok there. My timing was a little off, so I put it back into spec (7 deg. BTDC). I also found that the egr line that leads from the exhaust to the carb was completely clogged with carbon deposits so I cleaned that out. My vacuum comes in at about 17-18mm HG. When we say steady needle on the vacuum gauge, mine seems to flucuate about .5mm HG. Is that OK? What else could it be? It seems to run better, but not flawlessly at idle after driving around. Could this be the infamous cracked intake manifold issue? When the thing gets warm, the crack closes up, but not completly. Any thoughts would be appreciated.