Turns over but will not crank and dash lights going crazy

Sometimes it cranks and sometimes it will not. When turning the key sometimes it cranks or at least turns over other times it would not do anything. I just changed the ignition now it is turning over every time. Sometimes it will crank but when it does it usually shuts off immediately. All my dash lights are going crazy! I unplugged my light and plugged them back in suddenly it started running fine. Managed to drive to the gas station with no issues, but when I left the gas station headed home I had my headlights on and as soon as I hit a bump in the intersection all my dash lights including my stereo started going nuts again and the engine started trying to cut out. Also, when the key is turned to the on position the throttle body is making a weird noise. I have already sunk $25,000.00 in this truck mechanically I am on the third motor and second transfer case in this truck since I bought it. I cannot keep sticking money into it. I have been to several different shops and each one gave me a different answer to the problem.