99 Trooper Stall and CEL

I have a 99 Trooper and began from least April, the CEL keeps coming on
when the engine speed reach 3500+ rpm, and engine stalls in front of
traffic lights or when I shift from P to R. I went to AutoZone a few
times and got code 137 157 171 1171. Most of them are about low voltage
in oxygen sensor, lean in fuel mix. I also went to dealer for 5 times.
The first time they changed the intake gasket (the second change, the
first time was in 2001), later they asked me to use better gas, in the
most recent trip, they asked me to change fuel filter and fuel pump. I
changed fuel filter and the problem was still there.

I am wondering what cause this problem (CEL and stalls). The followings
are the possible reason my friends and dealers gave me:

1. Intake Gasket.

2. Oxygen sensor.

3. Fuel pump.

4. ERG valve.

5. Something else?

My fellow Trooper fan, can you guys use your expertise and give me some
suggestions?

Thanks!

Peter

Peterisme <peterisme.DeleteThis@yahoo.com> wrote:

 > I have a 99 Trooper and began from least April, the CEL keeps coming on
 > when the engine speed reach 3500+ rpm, and engine stalls in front of
 > traffic lights or when I shift from P to R. I went to AutoZone a few
 > times and got code 137 157 171 1171. Most of them are about low voltage
 > in oxygen sensor, lean in fuel mix. I also went to dealer for 5 times.
 > The first time they changed the intake gasket (the second change, the
 > first time was in 2001), later they asked me to use better gas, in the
 > most recent trip, they asked me to change fuel filter and fuel pump. I
 > changed fuel filter and the problem was still there.
 >
 > I am wondering what cause this problem (CEL and stalls). The followings
 > are the possible reason my friends and dealers gave me:
 >
My guess is that its a Jap engineer with poor English telling you its
time to SELL!

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