[shorod]

Welcome to the forum!

I'd suggest you try adding a bottle of fuel injector cleaner to the tank. Run it for a hundred miles or so and see if it helps.

If not, next time the engine is acting up, take a can of throttle body cleaner and spray it around the intake manifold gasket. If the engine speed changes, you probably have the fairly common intake manifold gasket problem.

If the intake manifold gasket does not appear to be the problem, then check the engine coolant temperature sensor. A sender drives the temp guage on the instrument cluster, the sensor is what the PCM uses for fuel management and timing adjustment.

As for a scanner, yes, a true scanner with datastream mode will be able to tell you information about the engine even if there are no diagnostic codes set. However, the less expensive code reader will not. Your 1995 is OBD-I, so the auto parts store may not offer the free code reading service. Many times this only applies to OBD-II systems, but it may be worth asking.

-Rod