thanks for the responses everybody, i will try to address them in order.
snotwistr: i will try a larger capacitor. that was also suggested to me by a friend. not sure about an inductor, i will have to look into how they work.
eugenweij: i don't have the battery any more unfortunately
settra: again, the charging and discharging solution wont work since i dont have a battery. i have already done the big 3 upgrade for my alternator and battery. i will try to run a dedicated ground wire from the trunk to the battery this weekend to see if that makes a difference
byrd: the interference occurs even when my vga cable is disconnected completely, so i don't think it's coming from there
heavymetals: same as above
randy taylor: all devices are powered from the same P2140, so not sure what you meant here.