I had my 69 MGB tuned up, new plugs, wires, oil and filter, condenser, points, rotor and distributor cap. I picked it up from the shop and it ran great. I drove it for about 1.5 hours at 45mph with no problems. All of a sudden it began to run rough, back fire etc.. It went downhill quickly and after a few minutes of that it hardly ran at all.
I can get it to start but it won't run on it's own, lots of backfiring and no power when I give it the gas.
Any ideas as to where to begin? Any advice is greatly appreciated.
Thanks-Ian