engine missing @ 1500 rpms

[marine rx]

just bought a 1999 f350 drw 2wd 7.3 with 61000. drove the truck for 250 miles and it started to miss and lose power. scanned and came up with no codes ran cct cyl. 4 and 8 failed. did buzz test and got idm failure code (heard that happens with some scanners) replaced uvch and gasket no improvement. any help would be great it is my only vehicle and dont want to make things worse. if i had a cylinder low on compression shouldnt i see smoke.

[marine rx]

bump.... anyone

[marine rx]

anyone got any input

[6chevy9]

I'm battling with my early 99. I think a cam sensor could be to blame? But I'm not 100% on it. They are really cheap to replace though. I'm not a fan of buying random parts but I hear a lot of people keep a spare in the glove box. I wish you luck!

[Codum]

When you did the buzz test, did all all buzz normally? And your truck is not smoking? Have you checked your ebpv sensor and tube? Mine was clogged up once, I cleaned it out and I noticed a little power increase. Never had a code. How bad is the miss? How much of a power loss? At times I have thought I had a slight miss, it always goes away, I think it my have been fuel related??? I just had a new transmission put in, feels like I have more power than before, guess it was slipping and I did not notice.

[jesilvas]

Try a cam sensor.
Black, Grey, & Dark Blue Cam Position Sensor Perdels Test - Diesel Forum - TheDieselStop.com

[marine rx]

miss is pretty bad between 1300 and 1700 rpm and at idl will lope a bit. have a cps but truck went back to the dealler and have had it for over a week they are saying a bad idm. suppose to get the truck back today lil skeptic because at first they told me the truck was 100% and they did a capression test right threw the injector hole......B.S........so i wait to see. suppose to get it back today.

[Codum]

Did you ever get your truck fixed?