The 'Anti-Fowlers' are used to Isolate the O2 Sensor, from fast changes in o2 concentration.. this is not a good thing when used in a fueling Loop.. it's Fine ( and Desirable ) in a Cat Sensor loop..
Need to get the Car running for a few drive cycles to get the fuel trims settled..
There are 4 fuel trims..
2 Long , 2 Short.. they are for bank one, and bank two..
Idealally you want the LTFT for bank one and two to be ~+5.. that is where the Stock Spyder Air box runs..
The STFT's should be less than +-5 for both Bank one and Bank two..
If the Long term Fuel Trims are different from each other by more than 5, you have an Injector problem.. or an Intake leak..
By Removing the 'Spacers' the fuel trims will now react faster, and the STFT's can do more work for you..
Ideally the STFT's will be the same Bank one and Bank two.. ( ~2 from each other )..
Let about 3 or so Drive Cycles go by, then look at the Fuel Trims with the Engine Idling at 2K in the parking lot.. I expect to see
LTFTB1 +8
LTFTB2 +8
STFTB1 +2
STFTB2 +2
Or something like that.. with the Speed Constant.. and while driving on a steady load.. should be about the same..
If the Trims are out in the Double Digits ( >10 ) then something is amis.. also the long trims should be close to each other.. and the Short Trims should be close to each other..
Post what you find..
Cap