My '96 ti has a really rough idle also...
Sometimes it idles so badly that the entire car shakes. Occasionally it will completely cut out with no throttle power at all, even if you pump it. Best remedy whilst driving is to put the clutch in and rev the engine a few times...I find that generally it cuts out more often if I'm running the air con or CD player. At traffic lights it will drop to really low revs as if it is about to stall, every now and then it will actually stall.
At first we replaced the oil filter, fuel filter, spark plugs and oil. When I bought it it hadn't been in regular use. From forum scouring I read that the MAF, can shaft sensor and IAT sensor can all be potential gremlins for idle problems.
A few weeks ago it was run through a code reader and the cam shaft sensor code was thrown up. We have ordered a replacement but are waiting on shipping.
Two days ago it got worse. It started 'putting', misfiring and backfired a few times. It currently sounds like a Suby
I shall let you know how the idle problem goes when we get the part.