dodge avenger code = po300d

Help. It is me again. Just had a tune-up on my 98 avenger. And now as I slow down and then depress the gas it does not want to go. Brake pedal starts to lock, etc. Hooked to a computer today. Code was P0300D - was
told "misfire" either the distributor or computer. Both are expensive. Anyone know anything about this or have any advice? Single mom - I need to really watch the expense, but Have to have a way to go. The dealership said I could take it to then for further test which will be 97.50. HELP
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I was also wondering if the tune-up that was done was just a temp fix or could something be wrong with that work?
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First of all Mom why not take it back to the place that did the tune up? You are getting a cylinder misfire code and obviously the tune up didn't fix it. If they cant diagnose you vehicle then take it to a good known dealer that will fix it and get your money back on the tune up.
If they are telling you that it needs a distributor or a computer they have no idea what is wrong with your car because that isn't going to fix it.
My opinion
Glenn Beasley Chrysler Tech
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