radio acts like its skipping only when truck is running

[chevyman1986]

i am having a major problem with my radio the truck is a 1986 chevy k10 custom and i just installled a jvc HD reciver with dual usb jacks and aux port well since i installed it i cant even listen to it when truck is running. if i have truck off and put key in the on pos. radio works just fine but when i put truck in start pos. and have truck running the radio acts like its skips in all sources im getting constant power 14.3 to 14.5 volts to radio threw main fused line and constant wire. no one knows or has heard of a radio doing this that i have asked. lights in the radio dont dim or go out and radio doesnt turn off only problem is the sound cuts out when motor is running and then sometimes will get worse if i give it gas i have ran main power and ground from battery to radio and same thing ive rewired all speakers with 16ga wire and still nothing so any help will be great cuase i been working on this for 4 days now