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Q: motor surging at speeds of 10 to 20 miles an hour on 2000 Chevrolet Express 2500

Apprentice 7fcc12909ae64520525213c612d1ef7ee84ad402e611d9a259270b15abea875b
PLEASE DONT ANSWER MY QUESTION WITH JUST A RECOMMENDATION,PLEASE LEAVE IT OPEN FOR SOMEONE WHO MIGHT BE ABLE TO.

I have codes p0453,p0340,and p1870,the fuel pump pressure is 60 psi with the motor running or just the key turned on and it doesnt bleed off.It is also hard to refuel,the gas pump at the service station keeps shutting off.
Ive been working on this van for two years solving all the problems with it,this seems to be the last thing,and it is cutting into my paycheck. PLEASE HELP
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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Reset the timing , replacethe FTPS , flush the Trans. and clean the cobwebs out of the fuel tank vent hose.
Thanks,i had this question up before and two people told me to take the car to a master mechanic,wich i can figure out,and then no one else answered,also what is the ftps valve?
I asked this question awhile ago but iam now just working on it,where is the ftps? is it mounted on the fuel pump?
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