97 Olds 88 3.8 misfire
 

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