I've been trying to tune my 340 and it seems to have a cough/pop when the RPMs are brought up in park/nuetral. When it does it, I noticed the dome light dims as well(voltage drop?). I've checked for vacuum leaks and can't find anything.

Any ideas what could be causing this?

340, 750dp, torker 340 intake, MP orange box- 20* initial 35* total.

Thanks guys. I appreciate any help. I'm about to pull my hair out over this.