Surging when temp hits 205

[Zach75]

Hey everyone, my 08 megacab started surging after a head gasket was replaced, seems to be worse when hot out or going up long hills, just keeps cutting out briefly until temp goes down, got a programmer but I turn it off and never use it, just had the fass fuel pump replaced, still does it, any ideas?

[Me78569]

are you %100 sure the programmer is actually off?  is it exactly at 205*?

[Mopar1973Man]

How many miles on the truck and injectors?

[Zach75]

240 k and I don't know if they've been changed, I got burned by this dealership, had to put a head gasket in right after I bought it, and I've got way too much wrapped up in this thing

[AH64ID]

Have you talked to the shop that did the HG?

 

[Zach75]

Yes, I had to basically make him go drive it up the hill to see it was still surging, he said he didn't know other than to start " throwing injectors at it", he did the fass fuel pump, I put a solid fuel rail bolt in, next I'm gonna try putting a new back pressure sensor in and cleaning the line

[AH64ID]

Take the solid fuel rail bolt out, it will cause long term issues. 

 

Have the crossover tubes been retorqued?

 

Do you have anything to monitor load, rail pressure (desired and actual), boost?

Edited September 16, 2020 by AH64ID

[Mopar1973Man]

Yeah try and get live data of the rail pressure and what your idle engine load is.