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Re: 1993 Ford Escort 1.9 Litre
Assuming all was well before replacing the thermostat....
The main components you would have messed with are the coil pack and wires, and maybe a couple sensor wires.
As for the rough idle, I would triple check that your spark plug wires hav good connections. This engine will run on 3 cylinders but will lack power and idle strangely. The #1 is the usual culprit. Make sure they are secured at the coil pack also. Physically remove them, push the bushing back just slightly so you have a visual of the connection, then push the bushing back over until it locks down.
As for the surging I would recommend somewhat the same thing. Inspect the whole area for any wires you may have left disconnected, or loosely connected. The computer is likely missing a signal from somewhere and is trying to compensate.
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