Check engine light on, cruise flashing?

As a follower up question. Whenever I start the car, it runs poorly has no acceleration. It appears that depressing the Gas pedal causes worse performance. The muffler also runs with a puffing sound.I remove the upstream Oxygen sensor and perform a heat test on it an it seems to be OK. I also tested the downstream O2 sensor before I replaced it. This one did fail my heat test. Could the timing belt be causing this problem?
Original Question ( had $10 donation):
Vehicle - 1999 Subaru Forester AWD had the following check engine error codes: P0170, P0463, P0130, P0136, P0301, P0302, & P0303. I disconnect the battery, reconnect battery which clear the codes. Now the car seems to have no acceleration power. If I press the gas pedal the rpm jumps up to about 3000 rpm and drops to below 1000 rpm and the vehicle has no acceleration power. I changes the downstream oxygen sensor, the PVC valve and the 2 air filters, sprayed the MAF sensor with MAF cleaner to clean it but

The subaru was running much better( It would hesitate a little before accelerating) before I disconnected the battery which reset the check engine light codes. The puffing muffler problem started after the codes were reset. About the plugs; I will remove/check and replace the plugs and then check the fuel pressure if my local auto parts store has the equipment for checking the fuel pressure.

1999 Subaru Forester 4 cyl All Wheel Drive Automatic

my chech engine light comes on and goes off after about 3 to 4 trips. It seems to come on more frequently and now before I turn the engine on I m hearing the fan blowing. Can u help