itspalm

It runs good, idle is slightly high at first but once it warms up its normal, and yes its sucking quite a bit of gas.

Its throwing up 2 codes, bank 1 and bank 2 running too rich

I recently replaced the intake manifold gasket so I really doubt its a leak, I will check but incase it isn't do you have any other suggestions? Also is this something that i could potentially get tuned and fixed that way? 

7 hours ago, Dean2 said:

Check for an intake manifold leak. If you have a leak, additional air is being pulled into the engine and the ECU will add fuel to balance it out. Causes really poor gas mileage and what appears to be a run rich scenario.

How would you recommend i check for this?

Car has been running rich for around the past month, I've replaced the 02 sensors and made sure they're on snug, new MAF sensor, new TPS, New Injectors, New Fuel Pump, New spark plugs, new coil packs but it's still running rich. I've tried unplugging the battery overnight to try and reset the ecu but nothing is working. Does anyone have any suggestions on anything I should look at or attempt in order to fix this issue? My long term fuel% trim is at -40% for both bank 1 and bank 2.