I have a 2000 buick regal gse supercharger and just did a oil change and changed the starter but in the middle of all of that I took my spark wires off from the top part of my hood were the numbers are i dnt know which order they go back on and is that a reason for my car not starting

SOURCE: Car starts then stalls out...

could be to many thing to take chances with, but most commonly;fuel filter,gas line antifreeze or a crack in your air intake which would take your vacuum seal away, start with the least expensive and work from their. Worst case scenario pinched fuel line

SOURCE: wheres the supercharger oil plug in the buick regal/1999

if you look on the top of your supercharger, you will see it. u have to get it out with a hex screwdriver

SOURCE: Car starts but won't stay running it's a 99 buick

CHECK FUEL PRESSURE IT SHOULD BE 41 - 47 PSI. IF NOT REPLACE FUEL FILTER.IF NO CHANGE. REPLACE FUEL PUMP.IF FUEL PUMP IS GOOD.YOUR PROBLEM COULD BE A INTAKE LEAK OR SPARK IGNITION PROBLEMS.ALSO USE A SCANNER TO CHECK FOR FAULTY SENSORS OR THEFT DETERENT PROBLEMS.

SOURCE: buick regal 92 3.8L Horrible fuel mileage

Sounds like you might have an oxygen sensor problem. Your catalytic converter(s) maybe defective or dirty. That in turn can dirty up the oxygen sensor. A defective oxygen sensor will send faulty info to the computer, interpreting the fumes as cold (even when the engine warms up). That causes the computer to adjust the fuel mixture to very rich, giving you poor gas mileage and the fuel smell. Hope it helps.

SOURCE: How do I replace a starter in a 2000 Buick regal

The starter is on the underside of the transmission, there are wires feeding the solenoid (remove) 3 starter bolts (remove) pull off transmission/flywheel