2000 ranger 2.5l stalls when revved too high?

[check35]

It also stumbles and shakes real bad on startup.... I just replaced the iac valve but that didnt do anything lol. Please help, it idles really bad and loves to shake!

 

[arco777]

Getting any codes, KOEO or KOER?

Also, check your fuel pressure.

I'm more knowledgeable on the 4.0, but on those motors the MAF going bad causes all kinds of problems. In most cases you can unplug the MAF (forcing computer to use speed density) and if it runs better, the MAF is bad.