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

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

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1 answer 6 comments
Reset the timing , replacethe FTPS , flush the Trans. and clean the cobwebs out of the fuel tank vent hose.
I RECOMMEND this too. What ever engine you got!
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?
F uel T ank P ressure S ensor
thanks
Good luck!
I asked this question awhile ago but iam now just working on it,where is the ftps? is it mounted on the fuel pump?