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Rich84 · 05-10-2018, 08:58 AM

I have a 2004 Van 6.0 that I put in a 1986 longbed..Idles smooth until you rev the motor. As it decreases idle it stumbles as it idles down.
Exhaust is a little leaky it is just kind of patched together so I can get it to the exhaust shop.
It has 2 codes 135, and 155 for the o2 sensors. If I unplug the MAF it runs and idles perfectly.
Is this happening because of the small leaks in the exhaust? Vacuum leak?

05-10-2018, 08:58 AM	#1
Rich84 Registered User Join Date: Mar 2012 Location: Woodbury, Ct. Posts: 1,667	6.0 Swap Stumbling Idle I have a 2004 Van 6.0 that I put in a 1986 longbed..Idles smooth until you rev the motor. As it decreases idle it stumbles as it idles down. Exhaust is a little leaky it is just kind of patched together so I can get it to the exhaust shop. It has 2 codes 135, and 155 for the o2 sensors. If I unplug the MAF it runs and idles perfectly. Is this happening because of the small leaks in the exhaust? Vacuum leak?