I need to remove the throttle cable from my '69 Road Runner and I'm having difficulty. The cable is off at the pedal and the C-clip is removed from the inside firewall. I thought it should just pull out at that point and it doesn't. It's pretty tight when I try to pull it out. I removed both bolts from the engine side firewall plate that the cable goes into and it remained on the firewall. In fact it looks like it's welded on to the firewall but that could be painted sealant. Do I need to take that plate off to get the throttle cable out? If no what could be holding it up?