Curious as to what could be causing a very rough idle on this vehicle. I've replaced the spark plugs and wires (they were all original 95,000 miles on them) They are correctly gapped, I replaced the fuel filter, I have pressure on the fuel line for sure. I took off the distributor cap, and the points were worn, and had a white powder built up on them... Not sure what it came from, but almost like you get on battery terminals. I don't think it was from all the salt on the roads (I sure wasn't going to taste it to find out)
It is idling so rough, it makes the entire blazer shake (which doesn't take much, but still...). It seems like it isn't firing on one or more cylinders, because it almost seems like I can smell the unburnt gas out the exhaust and the backfires. It has plenty of power as soon as you press on the gas, and doesn't seem to have any other problems, just at idle. The service engine soon light comes on occasionally while I am driving, but it goes out and when I check for stored codes, there aren't any...
Any ideas on what I could check before I pry open the wallet?