Hi,
Maybe your RX module picks up so much noice that it is constantly receiving "data" and therefore you are more or less stuck interupting all the time...
Pull out the RX module too and connect the RX pin to GND.. that would leave you with a LED in the main loop and the TMR1 LED toggle.
when you have done that.. take a new pic and send data from new pic TX pin to OLD pic RX pin using a cable..
Or put a scope on the RX pin you have today and see what is actually happening....
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