Brian, there are a few diagnostic tricks you can do with a newer Q-jet. First of all, try pluging the port going to your pcv. Sounds odd, but trust me on this. 2nd, all Q-jets past 82(?) are feedback style. As such, the TPS will throw the entire carb out of whack. You have the option of a voltage test, or simply unplugging the carb for a few seconds and hitting the throttle once. If it stumbles, the TPS is good. if it does nothing else and runs the same, grab a throttle position sensor. thats the white(maybe gray/black) three prong connector on the right side of the carb. To replace it, youll have to lift the top off from the carb. Finally, there is a mixture solonoid on the left side of the carb in the front. Many times these will stick due to rust/bad gas/other fun contaminants. The easiest way to get ahold of this is to open the carb and spray it liberally with carb and choke cleaner. then manually move the solonoid free. Finally, in order to get ahold of those screws, try a cobalt or titanium bit. they ARE drillable, but drain the carb complelty and be carefull. Good Luck