What kind of maintenance has been done on the car like in the last year or so? That kind of helps narrow down and eliminate a few things. Ignition is the kind of basic starting point on them. Pull the distributor cap and take a look at it in the light check the contact. Also, look at the rotor real well. Has the fuel filter been changed on it very recently & the spark plugs. Have you tried pulling codes on it? It's easy to guess, but guessing gets expensive when it doesn't help the problem. I noticed you have 207K on it. Has all the maintenance been followed pretty well?