After months of not being able to start the engine, despite fuel, spark, air and timing all OK (Pinto 2.0 with DGAV Webers), it started yesterday by holding a rag over the air intake to the carb. Battery has died due to the number of times I have tried to start the car. Today with a new battery, same thing. Car won't start, but as soon as I put a rag over the air intake it started fine. Once it has been running for a few in minutes it then starts fine every time, while it is hot.
Any ideas why or what to do?
Thanks