Where to go next with Misfiring 300TE

[ps2cho]

Before posting give a quick read of whats in this post please it will take only a minute at most!! I get too many of the same responses.

Car is 1988 300TE with 87,000 miles right now.

Compression within 1bar at 185 +- 5

Parts replaced:
* OVP
* Coolant Temperature Sensor
* Injector's+Seals
* Non-Resistor OEM Bosch H9DCO's
* Ignition Wires
* Distributor+Cap
* Fuel Filter
* Valve Stem Seals
* Fuel Distributor
* Ignition Coil
* Fuel Pressure Regulator
* O2 sensor
* EHA Valve
* Smoke tested for vacuum leaks


Where should I go from here?

I have no problems accelerating and it only exists at idle. I had my local mechanic smoke test it today so vacuum leaks are off the list!! There is no check engine light on, or any error codes.

Rpm's bounce about 50 at idle....It can't be mounts as sometimes it idles perfectly fine, but other times its horrible....very variable...and along with the rpm's bouncing....its not related. You can see the engine is shaking + surging when you pull the hood and doesn't sound as happy as it could be.

He mentioned that I have a leaky thermostat housing, but that shouldn't be causing a misfire as my coolant temperature is fine....but I've ordered the gasket to fix that soon anyway.