So getting excited for TMP on the 28th and now I'm having issues with the Stang.

When I give it power it kinda slips. Around 3000+ rpms I feel slight slips and small jerks and I'm not getting full power to the wheels. Even the exhaust sounds different. It kinda meaner but not normal. It only happens when I push it. Sitting at 3000 rpms is fine.
The check engine starting flashing when I pushed it hard while trying to get a feel for it. It flashed for about 20 sec after I let off. I haven't seen it since but I also stopped driving it hard. now I slowly accelerate to speed.

I'm not mechanically inclined (i'd like to be, but haven't found anyone to teach me).

This all started Sunday. The only thing I did was clean the engine bay on Sat. Normally I'm very carefull and I've done this many times before. I cover the alternator with a bag and I stay away from the belt and pullies and I use a soft paint brush for the hard reach areas. I'm also getting a faint burning rubber smell from the engine bay.

Maybe while doing so I messed something up? Maybe some of the spark plugs arn't fireing? or my clutch is slipping or something else?

This is my luck... I'm not allowed to be too excited about anything! something always happens!

I just hope it doesn't set me back too much or I'll be spectating with my new helmet

Not sure if anyone knows whats going on or knows how much this is going to set me back

Edit: forgot to metion that even idling sounds differnet