Please Help with Engine Diagnosis
 

Well to start off about three weeks ago a single ignition coil went out, so I replaced all 4 of them. I already have fairly new plugs and upgraded wires. So that fixed that problem. Then the following week my fuel Pump dies on me. Got a new one and replaced it. Everything seemed to be normal again, acceleration and fuel economy was better than ever.

Then this past week, it seems after I start driving during mid day when it's hot and humid outside I get a really slow acceleration in 2nd and 3rd gear. Its usually not right away though. After I've been driving for a mile or two it starts. Also, I noticed a different intake acceleration sound. I have the second generation K&N short ram intake. The sound gets really deep and scratchy when trying to accelerate. Sort of like when an ignition coils goes bad, but not as severe. And today it stalled on me as I pulled into a gas station. Which has never happened. Anyway, from what I've read it could possibly be:

1) My cat is going bad and should be replaced.
2) MAF sensor is going bad and should be replaced.
3) My Vaccum/ Compression in one of the rotors is bad and engine needs to be replaced.

Is there anything else I should check or which of these should I troubleshoot with first?

Check for vacuum leaks within the intake setup.
Clean the MAF with contact cleaner.
You didn't mention if the CEL came on, so I'm assuming it didn't?

The CEL did not come on, which I thought was weird.
Thanks man, I'll try cleaning the MAF and go over all my connections again.