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My current amp seems to have issues with any distortion pedal I run through it, Currently im using a cheap PROformance 60 BA 185watt bass amp which is ok when im playing clean, with wah, delay or even using the "shape" on my pre-amp pedal, but whenever i run a distortion through it, it just feedbacks constantly no matter what i adjust the settings to, Currently im shooting out with an Electro-harmonix big muff and a Boss ODB-3 overdrive but Its really bugging me how this keeps happening. Im wondering is it the amp or the pedals?

Probably it's how you have the amp set. Nevertheless, instead of spending your money on pedals I think you ought to save that money and put it towards a decent amp.