CAR IDLES GREAT BUT WHEN YOU GIVE IT FUEL IT REVS A LITTLE AND ACTS LIKE ITS CUTTING OUT. CHANGED FUEL PUMP,THROTTLE POSITION, TIMING AND STILL NO LUCK NOTHING ON SCANNERS BUT RANDOM MISFIRE ON ALL CYLINDERS ANY ADVICE WOULD BE HELPFUL!!!
If this car is burning excessive oil then its possible that the catalytic converter is clogged.
Have you actually checked fuel pressure with a gauge (you might have a bad regulator)
Have you checked that your TPS doesn’t have a bad spot (I have run into plenty of bad new parts)
Are your ignition components in good shape (plugs, wires, etc.)?
Like americar said, your cat might be clogged by now.
Check your backpressure with a gauge and post back, please.