on my car i changed the 2 fuel filters (secondary and primary). it ran fine, a week later i ran diesel purge through it and it got better. the second one doesn't apply to your gas car tho.

i also changed the oil, air filter, and also the air pump thingy (when you have air the the fuel system on diesels u use this to pump it out).

maybe you can run it on starter fluid and see if it runs better then its a fuel problem?

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05