There are many things that it could be, but you should try checking your fuel pressure regulator. Did you replace the fuel filter first?
where is the fuel reset swith for a 1989 mercury topaz
you could use a turkey baster
Idle could possibly be too low.
There is a circuit breaker thaich could be bad.
Most Likely A Leak, Caused By The Gasket Needing Replaced On Valve Cover. When You Install Gaskets Put In A New PCV Valve This Should Take Care Of It.
Clean them and see.
Something loose? Exhaust pipe rattling/hitting on something? You'll have search it out.
Only the 2.3L HSC Inline 4 will fit in the 1986 Mercury Topaz. If everything in the engine bay were gutted, perhaps something larger such as a 3.0L V6 from a 1992-1994 model MIGHT fit but it would require a complete running 92-94 Ford Tempo or Mercury Topaz with the V6 engine as a donor car (and, if you could find such a car, it would be more worth your time/money to invest in it v.s. a 1986 model). The automatic transmission from a Taurus WILL NOT WORK in a Tempo/Topaz.
You have bad spark plugs and they need to be changed or there could be a bad vacuum line that needs to be replaced.
Not if the proximate cause is replacement of the coil wire. Are you sure you have the wire securely snapped on at each end?
depends on the year if it's older it will cost more because something might need to be replaced and the older it is the harder to find the part but in general I'm guessing it could run you from about $300-$1000 like I said depending on the model
First, check the rad. Was it ever replaced? If it is good, check the thermostat, Does it overheat at idle? or on the road? At idle, most likely the Rad. On the road, could still be the rad. or possible the thermostat. Also, was the water pump ever replaced. That will also cause overheating. As time goes on, the impeller wears, and will not push the water fast enough. Good luck.