One of my precepts of troubleshooting is - What just happened?
Check your work - something connected wrong, or not connected.
If you worked with multi-pin connectors, look inside them to see if a pin has backed in.
On our '88 745 GLE, one of the pins in the mass air sensor backed in, and the car would not accelerate. Interestingly, it went fast in reverse, but not going forward.
The car had just been tuned by a dealer tech, and in order to change the air cleaner, the MAS had to be unplugged.
If a check of your work does not produce results, do not throw parts at it - chances are only one thing is wrong - see a dealer or indy?
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