2002 Suburban running rough

[lrodptl]

Any ideas? Thanks.

2002 K1500 Chevy Suburban, 5.3 Liter Flex Fuel, 193,500 miles, just replaced
plugs and wires.

Cold start, runs rough, tripped codes P0171 (2 - one for bank 1, one for sensor
Bank A) and P0174 (also 2 - one or bank 2, one for sensor bank B). Runs great
once fully warmed up.

Intake manifold pressure bounces round 11- 12 and goes to 10 steady once warmed
up

 

[zora]

Did the problem start after you replaced the plugs and wires or before? these are the suggestions for P0171 and P0174
http://www.obd-codes.com/p0171

http://www.obd-codes.com/p0174

 

[lrodptl]

Before the plugs/wires. Intermittent in the cold. Warm weather, the problems go away.

I cleaned the MAF and the problem went away for a while but the weather also got warmer. I could replace the MAF.

 

[zora]

look first at the suggestions concerning vacuum leak

 

[Chuzz]

Check your coolant temperature sensor and make sure it's up to snuff on the resistance readings.