M104 miss

[Glen]

Hi folks,
Car is a 1995 E320 wagon, W124.092. Currently has 207,xxx miles and the upper engine wire harness was replaced about 85K miles ago (4 years ago).

Here's the scenario, last weekend I flushed the brake system...that went very well, but I spilled a bit of brake fluid in the engine compartment. So, I sprayed it with a degreaser and then proceeded to hose the engine down. I've cleaned the engine like this many times and have never had a problem but now the engine misses at idle and throughout the rev band.

Checking through my maint. records, I noticed it had been about 45K miles since I changed the spark plugs, so I went ahead and put in some new Bosch Copper Plus plugs. The miss was still present so I changed the ignition wires and under coil boots...the car had the originals so I figured they were due. The miss is still there.

Around the same time I did the wire harness, I replaced all three ignition coils to fix a similar miss and rough running. Since I kept the old ones, I tried swapping them in one at a time to see if I could isolate the current problem to a bad coil. I didn't come up with anything conclusive.

My question is, does this sound like a coil(s) problem and do you think I should just replace all three coils again? Is there an easy way to test the coils?

Thanks,
Glen