I have an 87GN 11s car with all the usaul mods and basically runs good and strong except alot of times when I'm rolling along at say , 40,50,60mph and I give the car boost- half to full throttle i get between 20 and 30degree pull back in timing and i have to let off a little, then gradually get back into the throttle and its fine. I never have this problem starting from a dead stop. There's no audible pinging for sure. this has been going on for a long while. I replaced the knock sensor and I checked the exhaust and downpipe for loose and touching and there fine. I have an engine anchor and it seems pretty tight. I really don't know what else to check, but i'm sure someone out there has had a similar problem.any ideas?
My scan tool is the original scanmaster1 from 6 yrs ago and I run Reds 93 chip which is also 6yrs old