1992 Newmar Kountry Star

After the engine runs for a minute or so, it starts to sputter like it is starving for fuel. I thought that possibly the fuel pump was going bad, but a fuel pressure gauge shows that the fuel pressure is steady around 40 psi. Checked that the air flow was unobstructed, and it is getting air just fine. A spark tester shows a strong spark, right up until the check engine light comes on, then the spark weakens, the engine sputters, then dies.

I have searched for the diagnostic plug to try to determine why the light is coming on, but have been unable to locate it. I know if is the older style that will require jumpering and reading the flashing light, but I just can't seem to find it.

It is a Ford 460 engine.

Thanks,
-Larry

Description of symptom is incomplete

It dies...

In detail describe what happens from there, please...

best advice i can offer
look up your chevy 454 P30 chassis
or Ford 460 f53 chassis ?
by the year and chassis
get the manual and go from there

Your rig is probably on a 1991 Chassis OBD II did not come out until 1993 at the earliest IIRC