My Ranger 3.0 V6 RWD with 265,000 miles is having some performance issues. Not picking up any codes, however, once I get to around 3 rpm, my engine light will start flashing and I usually have no choice but to step off the gas once this occurs. I have replaced the fuel filter, air filter, TPS, MAF sensor, coil pack, spark plugs, fixed vacuum leaks, and an intake manifold leak very recently, as of this end of August, which all have helped, but, it was all supposed to anyway with these miles. Guys at the shop said she looks pretty tight underneath the hood from first glance and underneath. But, still a rough idle and lack of power. Fluids are good, always oil changed at 3.000 miles & Prob some other little things in there I’ve done that I haven’t mentioned. Looking for suggestions on how to move forward with ol’ girl. I’ve got big plans for her!

 

If the light flashes you have a pending code. Need to scan it with a scanner that reads pending codes which most cheap parts store scanners will not.

 

Welcome to the forum

Flashing CEL means "let off the gas, or engine damage may occur!!!" so very important to do just that

It indicates a bad misfire under load, and yes there should be misfire codes so you need to get those

As far as the cause, what YEAR Ranger?

2004-2006 3.0l Rangers have a TSB about misfires

Also rough idle along with the Flashing CEL under load would fit with that

Do you notice any pinging/knocking under load?