1998 Dodge Dakota exhaust system problems

Engine experiences rough and low idle, and stalling, dealer has replaced throttle body, manifold gaskets, and valve body, however stalling still exists, dealer stated the combination of stopping, shifting, and the turning of the steering wheel causes the engine to stall, there was also an oil pan leak and coolant leak, purge solenoid was also noisy. Reverse lights had a defective switch and the headlights had a defective switch. Exhaust was noisy and the exhaust bolts were broken.

I had catalytic converter replace last summer because it was defective . I have an exhasust leak know and took it to the dealer and they said I have 3 broken exhaust manifold bolts. They said it would cost 65 to 75 dollars apiece to fix. I work for daimler chrysler at twinsburg stamping as a machine repairman. I have never heard of exhaust bolts just breaking.I beleive there is a problem here they ought to fix. There more people at work that had the same problem. Thank you