idle fluctuates, plugs are fouling fast...ideas???
Less than 12,000 miles ago, I put new plugs, rotor and cap, all premium from NAPA. I also adjusted the timing because I brought the jeep from high altitude to sea level. The carb was rebuilt about 15,000 miles ago. It just wasn't running right - tended to stall when pulling to a stop at intersections. Turning the key wouldn't restart it - I actually had to tap the accelerator to get it to start. The fuel pump works, fuel filter clear, float chamber is full and the jets work. I pulled the plugs and found them to be severely fouled, appearing blistered with a white/grey hard substance bridging the gap (some plugs worse than others). The stuff comes off with a file or screwdriver. I adjusted the timing a smidge - clockwise. It seemed to run better, though at idle, the rpms would fluctuate - sometimes in the 500-800 range, others in the 900-1100 range. I cantell when it starts getting bad, because the jeep tends to stall out more often. I pulled the plugs for the third time (only about 300miles on them) and had two plugs with severe build up on them. I'm considering an ignition upgrade, or at least a "Nutter" fix, but I'd like to solve these problems before I do too much tweaking. Any ideas????
At altitude, the idle mixture screws had been leaned out, possibly too far, since the tailpipe was no longer black. Have since richened it up a bit. Also, it's a 258 with 40,000 on a complete rebuild, 165,000 total. Thanks.