Idling / Timing fault

[Countess]

Can any of you guys please help me out ???

My 1992 has idling (or timing?) issues. After 2-3 minutes from a cold start, it shakes and splutters and feels like it is going to stall. This only lasts 2-3 minutes, and then everything is perfectly fine. The mechanic has replaced spark plugs with platinums, and it was better for 2 days, then starting to get worse again.

$1000 and 3 days later (found 3 engine mounts that were "missing", and now my engine does not move when you rev, that was not cool). He is at a loss as to the cause, as it is hard to catch it being faulty. Ignition coils, perhaps??

Anyone had the same issues, and could give me a clue???

Thanks heaps !!