You may be able to find the engine in liter on a decal under the hood.
Have you pulled the codes to see if there is any.
You said you changed the plugs did you change the wires too, distributor cap and rotor?
What gap did you put the plugs and what type did you use.
Some other things that may cause this
Defective ignition wiring or connections fuel pressure vacuum leak.
When did it start doing this?
Monday, December 28th, 2009 AT 11:06 PM