got a 2002 ford ranger and replaced egr valve, altinator plugs and wires, and the truck wont pass 3000 rpm no check engine light. It just bogs at 3000 rpm, could it be the iac valve??

in any gear?

Could possibly be the exhaust or catalytic converter or muffler clogged or partially blocked

doesnt pass 3000 rpm only when in park

that's normal - the vehicle is designed with a rev limit to prevent people from blowing it up in park.

ended up that the dpfe sensor was bad after i did a keor self test. thanxs for all who replied.. the quote for rev limiter in park i did not know that was very useful thanks.