stumbling start + lean 1&2 - 4.0 OHV

[NathanielM]

fresh o2 sensor, ran two cans of seafoam through the gas tank, new air filter, new plugs and wires, new fuel filter, cleaned maf, checked for vacuum leaks twice, and running out of ideas...

When starting her up cold, she'll stumble for a little bit, if left in park it'll kick her up to 1500 for a while until the engine heats up, but by the time I'm down the block she seems strong. Also, she starts up fine when leaving the gym or whenever she's been sitting for a small amount of time...codes say lean 1 and 2. Suggestions?

 

[97ranger4x4]

The best thing you can do is take it to a GOOD mechanic to diagnose the problem. It is probably a vaccume leak. I had the same codes and had to replace the lower and upper intake gaskets and that took care of the problem. good luck.