I had the exact same problem, with the same model car. You need to replace the idol air controller valve. I bought one at the local repair shop for 80$. It should not take more than a few minutes to fix. It is located on the backside of the intake manifold. It is a black box near the center,and in the back. It has an electical connection that clips on the side of the box. There will be two bolts that will require an 8mm wrench or socket to take off. This is important....the replacement part(if new from the part store) will have to be put on the Opposite of the one you take off. In other words, on the topaz model, you will be putting the new part on upside down.
Mercury Topaz was created in 1983.
picture of the fan relay for 1993 mercury topaz
The 1994 Mercury Topaz has a chain and not a belt.
A 1991 mercury topaz has drum brakes on the rear wheels.
picture on how to replace a water pump for mercury topaz
does some one know the fireing block numbers for a 1994 mercury topaz 4
1994 mercury topaz 4cyl
how to set timing on 92 ford mercury topaz 2.3 engine
where is the thermostat
The wheel bearings for the Mercury Topaz are found on each axle. The average cost for a set of bearings is about 70 dollars.
sounds like you are too far down the launch ramp or you live in a really wet area ..
Your 1991 Mercury Topaz 2.3 liter has a timing CHAIN