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Hello All, I am new to this forum so bare with me please... xD

I have a 2005 GMC Envoy XL 5.3L
This problem started about a week ago.
1 day I went to jump in my car and when i turned to crank it over it started perfect like usaul, went on with my day. went to work, went to lunch, left from work to home.
couple hours pass and I go to leave for the store, i try and crank it over and it has no crank no NOTHING.
So then i thought it maybe my battery. checked battery voltage NORMAL
Go to start it again after the second try i starts right up. No Engine Light at this point..
Next morning comes around, go to start it, same thing no crank no start..
But this time engine light pops on.
So i went for the scanner, Scanned it Came up with 2 codes Crank Pos Sensor and Cam Position Sensors
so i Buy Both sensors and change the cam Sensor first because it the easiest to get to.
I got to start it after changed, and i twist to start it and it CRANKS but I let go of key after about 2 seconds and it continues to crank without me twisting ignition key..
then it stop after about 2-3 seconds and still doesnt start....
i try one more time and it starts, no engine light no codes now

now EVERY SINGLE TIME I GO TO START IT, IT CRANKS AFTER I LET GO AND WONT START UNTIL THE SECOND TRY...

why is this, and what can i do to fix it. it is very annoying and i dont want to break down when far from home....... or anywhere at that matter lol
any thing helps, thanks xD
 
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