the sputter

[silverbackexpo]

Ok today 4/1/12 I went to the shop to check on my expo. I started it up an at idle its starting to shake an sputter guys wat is this cause by spark or fuel.

 

[spiveyr1]

Sputter

Have to say my 06 5.4 has done the same for about 10 days now. Felt like bad gas so I added a can of Seafoam to a full tank. No difference so I changed fuel filter and filled up with Chevron mid grade. No CEL, no codes with SnapOn Modis. Coils check good. It sometimes shudders coming to a stop. Never stalls. Sometimes runs fine. Occurs at 20-40 mph. Increased throttle seems to overcome the condition. Am bringing to shop tomorrow (4/2/12) . Will post what they find.

 

[silverbackexpo]

Thanks let me know. But I was wondering if the mass air, air filter,an throttle body can cause things like this

 

[1997SCEBFEX]

Silver:

It could be your idle air control valve needs cleaning/replacing.

Alternatively, a dirty mass air flow sensor; easily fixed by using brake cleaner and letting it dry before reassembly.

 

[silverbackexpo]

Ok an those things would cause the suv to sputter at 2000 rpms an give it a rough idle.

 

[1997SCEBFEX]

Yes, it could be the IAC for shuddering when coming to a stop, or MAF for the 1800-2000K sputter, or somthing completely different.

How many miles? Any mods or recent [major] maintenance? You said "shop" to check on it......paint, body, tires.....?

 

[silverbackexpo]

It has 172 thousand miles an its bone stock. Wen I brought the truck it was airing in a guys back yard for a year an a half.