My 2000 Dodge will not start sometimes & it throws a PO336 code & engine light. If I use a spray of starting fuild it will start & run. The last time this happened the Tach would not read. When I clear the code it works fine. This seem to happen when I start cranking the engine & stop but start cranking again right away. Anybody got any ideas?

 

Crankshaft position sensor likely, do a search here for replacement.