Hot weather and A/C on will always bring about a bit slower acceleration due to air density (hot air) and load on engine (A/C Pump). If this was not noticeable in the past with the A/C on, then I would say that you likely have an issue with the A/C pump at this time and suggest that you do not run the A/C until fixed. If you do, you will likely burn up, or break your drive belt that runs your power steering, alternator, water-pump, etc. The other thing to check on is your temperature gauge. If there is no gauge, be sure the temp light is not coming on. Overheating will also cause bad acceleration, but also result in expensive damage to your engine.
If you don't find an inexpensive way to do this, you might consider the
truly wireless QuickVu(TM) Wireless Backup Camera. You may be able to
run an RCA cable from the receiver to your in dash monitor. Buy direct
from the manufacturer!
I have a 2008 Tahoe that had a similar error stabilization off, ABS errors, entire vehicle shutting off, door locks open/close at will, I changed out the Body control module and the programmer showed me the many communication errors from various modules, then one solution was suggested to change the Battery cable, so I started checking out the grounds and I found varying resistance from the Neg. Battery post to the Body so I removed the neg. cable to the engine and replaced the post with a threaded post connector and a 42 inch cable then added a 12inch to the frame, then also added a 12inch from the Neg. post to the body just under the Mega fuse, Make sure the paint is removed before you assemble and use the appropriate amount of washers to make the mega housing even to the body. No more errors, it was just a real bad ground and GM knows about this and it seems they are using this to make a lot of money off there unsuspecting customers,
