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My name Andy I will try to help with your problem.
First, I would scan check engine light code (please post for me), your car is OBD I more than likely so you will need to found some shop who can scan OBD I codes. Your local auto part stores like Autozone or Checker may not be able to.
Second, Look for simple staff like vacuum lines broken or misplaced or disconnected.
Also what spark plugs did you use, I would recommend use Motorcraft and set check GAP.
you need a scanner to read the code, on cars prior to 1996 you will need more than likely will be OBD I system, ask local stores or shop I think Meineke offer no charge code read, with a code much easier pin point the problem. I wouldn't use Autolite plugs for any cars, On my experience number 1 in fail as far as quality, usually if I write tune-up on any car I only use OEM brands and OEM plugs this is insure of any failure and other problems in feature. I don't see a timing issue at this time. Check IAC (Idle Control Motor) located on throttle body. Possible failure if it get stuck full open. You can take it off and cleaned. If fix problem replace IAC. But try scan car first, and tell me the engine code, I will help you to pinpoint father.
2003 Jetta left rear window blue plastic part of the