might be a bad coil, leaky injectors, leaky fuel dist., platinum plugs, worn cap and rotor, etc. only way to find out is to get a spark tester for the coil and look at the injectors, etc. for leaks. could even be everything. done that a couple of times. the tester needs to be something that plugs into a plug wire and is adjustable up to 40kv or so. you need to see 25-30kv as a test for a good coil. good luck, chuck.