help...stall at coldstart & jerk at drive

[fongo]

Hi everyone,
Not too long ago, I posted a thread on a problem I had at cold start. My 93 GT will start and then stall. After getting it to start propertly (giving it some gas..) it would hesitate and jerk a bit during driving. The idle would also be choppy too. But one it was warm, the problem would go away.
It was suggested to change the ECT, ACT sensors and look into the 02 sensors too. Well, I popped in new ECT, ACT sensors and even a new EGR valve (the guy at the DMV told me I was failing the NO on emmissions). I'd figure the 02 sensors are ok since I just replaced them about 1 year and half ago. I also replaced the distributor cap, checked plugs etc.
Well...after all these replacements, the problem hasn;t gone away! FYI, no 'Check Engine' lights go on, all the diagnostics appear to be ok. I did have problem scanning the EEC-V, but I probably ended up with the wrong scanner anyway.
Could anybody give me any other suggestions on what could the problem be? The mechanics down the block insist it's the 02 sensors...Could it be a compression problem? Need some feedack!
Ciao!