1995 Cadillac Deville

This car runs smooth up to about 3500 RPM, the it starts cutting out at a constant, loping pace. I replaced the fuel filter but no change. Any ideas?

NorthStar or what?

No, 4.9 L

Check engine light?

No CIL

Today I will check the throttle position sensor and plug wires for resistance.

Possibly a restricted exhaust system, failing/clogged fuel injector(s), crank or cam position sensor, weak/broken valve spring(s), check fuel volume and for proper vacuum at all rpm ranges. Just a few ideas in case the TPS is ok.

Thanks Xebadaih, I hope it’s something simple, but I’ll let you know.