hello, ive started using my TX1 2000 taxi and initially it wouldn't start so i got a new battery one week later it wouldn't start, got a jump start drove 12 miles switched off it wouldn't start. Then it went to the garage and i was told an ulternator then it started working. When the garage drove it home a pump went so im being told head gasket. I paid 700 then 500 in the garage to get it on the road. my question is should i get the gasket fixed and whats it going to cost also is this the start of more problems please help