Hi, had that problem too. Meaning that it drives and idles fine, but if driven and then gear into park the rpms shoot up. My problem were a neglected distributer, hanging / sticking weights with worn bushings. First of the most important - get a timing light. but this would mean solve your timing mark issue. Want a quick solution? Use number 6 - the opposite of cyl 1. hook your timing light to it, and it should read correct. This test can also be used to test for distributor wear. You can use any cylinder to set your timing - cause they all fire at the same moment in cycle. About the hard start when hot. If your timing is too advanced, the engines kicks back at the starter - this really hurts (in sound) But if you have a heat soak issue - the starter will crank slowly / hardly at all. Fuel filter: during idle - even the slightest flow of fuel is enough - as long as your bowls stay full. if you have problems at sustained WOT - start replacing fuel hoses / lines from tank to pump. pin size holes are a nightmare for mechanical pumps. @nicks78camaro these could be two problems. the first would be too much fuel, the other too less fuel (less is the opposite gramatically in this case, right?) Then there are a lot of different thing HOW the car can stall - and these would lead to the problem.