I just changed the Fuel Filter and put in 8 new plugs, and ran two tanks of Fuel injector cleaner, but I still have a bad missing at or near idleing.
It runs smooth at 800 rpm and higher, and will fly to 100 mph on a clear interstate 10, but it struggles at idle. It's the same if the engine is cold or after running to the store and running for an hour. Sunday as I pulled into church it died, but restarted fine and I parked it. After church we went home and no problem running 10-70 mph, just misses at idle.
It starts fine, does not smoke at anytime. Give it a little gas and its fine.

$50 spent without any improvement.

What should I check next?

Thanks

__________________
1998 Land Rover Range Rover 66K Miles
1988 300SE Totaled in 1998, hit by drunk driver, but we walked away OK
1989 420SEL 140,000, just warming up. Total by 18 wheel gas truck rear ended, but refused to lose another MB. Had it repaired cost $10,000+ Great Car again SOLD it for a 2003 C320 to save on gas
1991 2500 Suburban 454, 130,000, Best truck in the world. SOLD it out right.
1952 8N Tractor 1,000,000-/+