1995 3.8L Engine Miss
I have a 1995 Taurus SE with the 3.8L V-6 and 45k miles on it. I had the head gaskets replaced at 35K last summer right after i bought it and it has run well except I noticed a slight miss when it's running up a slight grade to my home and with some local driving that I do.
Over the last few weeks, I have changed the fuel filter, plugs, wires, cap, and rotor, and this weekend I took the throttle plate assembly off the intake manifold and thoroughly cleaned it, but the miss is still there. The old platinum plugs were pretty clean and gapped properly, but I changed them since I had new platinums to put in.
Coming up a slight grade to home, it seems to miss for maybe a second, then run smoothly for about 5 seconds, then burble just a bit again, and sometimes it will repeat for a third time before I get to a stop sign and turn.
I run interstate to work for about 10 miles and I can't notice it at highway speeds. I routinely get 20 mpg, and it starts and runs fine otherwise. The miss has made the car stall a few times now, say when I stop and back up, so my wife is getting nervous about driving it.
Any ideas would be appreciated so that I don't have to have expensive diagnostics without checking obvious things I can do first.