I have a 1997 Oldsmobile 88 with a 3.8 liter engine .

The car starts great from cold and is good until it reaches full operating temperature.

Once it reach reaches operating temperature or shortly thereafter it loses all power and there is no acceleration and sometimes it stalls.

I have replaced the crankshaft position sensor as well as the camshaft position sensor and made no difference.

Plugs and plug wires replaced 3 years ago with top-of-the-line silicone leads.

I checked all three coils and all 6 terminals of the coils produce a spark when I start the engine.

My first question is whether or not the simple fact that I do get a spark actually means that the coils are okay or is it more likely that one of the coils operates intermittently?

T Ihe code read out suggests misfire and low oxygen sensor. There are no check engine lights at any time that I have noticed.

Second question. Is there anywhere else where I should be looking?

Thanks

Give us the codes please.

How many miles are on it?

What is the fuel pressure cold?

What is the fuel pressure warm?

What is the fuel pressure when it is having this issue?

Has it ever had a fuel pump replaced?

Cant recall numbers but misfire and low O2 sensor

How many miles are on it? 65 k

What is the fuel pressure cold? don't know

What is the fuel pressure warm? ditto

What is the fuel pressure when it is having this issue? good question

Has it ever had a fuel pump replaced? No............but it sounds like you are onto something

That doesn't help us in any way.

There is a reason he'* asking these questions. His questions go hand in hand with my questions. If you don't provide us with accurate answers, we can't provide you a path to follow.

Yeah, gonna need those numbers. They could vindicate or condemn the fuel pump and/or the filter, but either way they get us to the next step.

Yes and I appreciate the questions and I will most certainly find out the fuel pressure ASAP.
Thanks for the questions. The answer is coming.

Code Numbers are P0131 and P0300