Throttle knocking on acceleration with AC on

I've noticed that I have some light knocking from the engine when I'm accelerating with the AC on, even just a little bit. Turn the AC off and it's not an issue. I haven't checked the plugs yet (not sure on their last swap) and I'm running 87 gas. Anything else I should check on? Thanks in advance.

 

What year is your Tacoma? Some of the later years had a retune to address some knocking.

 

2012 4.0 V6

 

You may want to try and have the dealership reflash your ecu. Your 2012 should be included in the TSB for the spark knock. T-SB-0044-14

My 2014 qualified and I got the reflash. It helped, but it didn't totally take it away. Some say running higher octane gas eliminates it. I tried it and it helped a bit more. I went back to 87 oct.

 

http://media.fixed-ops.com/Toy_ServiceBulletins/sb0044t14.pdf

 

Thanks a heap! Good to know.