I needed to have a new alternator belt today, so had the two replaced plus the air con belt which had broken last friday - Anyway, on my way back from picking up a customer from the station I seemed to start loosing power. Its about a 10 mile drive back, and after 8 miles it was all I could do, to maintain 35mph. Slipping it into nuetral, it would not rev beyond 3000 rpm and there was quite a bit of blue smoke. Just as we got back we could feel it start to miss as you revved it.
Got back in 20 mins later after customer had gone, and it seemed fine. Gave it a good thrash up the road and after a few miles the symptoms seemed to reappear.
Any ideas, Is there anything that could be dislodged doing the belts that could affect the engine. Sounds a bit terminal to me, and I am supposed to be away this weekend

.
The only other thing I have done is put a bit of fuel in - clutching at straws now

. I am OK with a router and woodwork, but spanners and engines are not my department.
Thanks
Ed