Hey, I have an 86 SI with 188k miles on the odometer, 50k on a rebuilt engine. Car has been running fine up until now. It randomnly will have a fuel starvation problem. Like, it would idle fine, then if you put your foot on the gas, it would die. Or, if you're on the highway, it would run fine, but if you put your foot on the gas, it would buck and shiver and feel like no fuel was getting through. I've done this so far: Replaced fuel pump, fuel filter, pcv valve, distributor, spark plug wires, spark plugs, checked battery and charging system, air filter. That's all I can think of. It runs better now, but still will do it randomnly. Oh, it'll only occur for about a span of 30 sec-1 min then run fine. Doesn't seem to do it under any particular driving conditions, just whenever it feels like it.

Any ideas?