get your egr valve checked.

dave mc

I had that (91), the stalks on the plug leads were cracked and floating in
oil. Re-seated the tubes around the plugs in sikaflex and bought new leads
(they come with distributer cap). Runs well now but still wouldn't idle
properly. I found the gearbox kickdown cable was way too loose, that seemed
to fix the idle though it still faulters a little with a/c on. Had tried to
idle it down as it seems too fast, but idle was not stable so I screwed it
back up. At least it doesn't stall now. Does your a/c idle solenoid make a
funny noise? mine has a weird air-sucking noise & I suspect it's not right,
but they are expensive and are not stocked at the local dealer here.