I cannot get more than 3k rpm, replaced plug wires and plugs. Anyone know anything to help?

 

It sounds like your cats are plugged.

I'm sure you've got a check engine light on... even if it isn't see if there are any pending or confirmed codes.

If you don't have an OBDII scanner, most major auto parts stores will let you use theirs...

 

Here you go.

Here are some parts if you need cats. Search a little more on your own, and you will find more options with different pricing and availability.

You may not need CARB compliant EO no., depending upon where you live.

PART # 545355

• EFN7FMXT04.23A4
• CERT STANDARD LEV2 LEV
• CONFIGD
• CONVERTER #2
• LOCATION LEFT
• TYPE UNIVERSAL
• EXECUTIVE ORDER D-193-120
• FITMENT NOTES
  ?
• PART TYPE CATALYTIC CONVERTER

PART # 545355

• EFN7FMXT04.23A4
• CERT STANDARD LEV2 LEV
• CONFIGD
• CONVERTER #2
• LOCATION RIGHT
• TYPE UNIVERSAL
• EXECUTIVE ORDER D-193-120
• FITMENT NOTES
  ?
• PART TYPE CATALYTIC CONVERTER

PART # 52154

• LOCATION RIGHT
• SERIES OEM GRADE
• TYPE DIRECT-FIT
• PART TYPE CATALYTIC CONVERTER

PART # 52155

• LOCATION LEFT
• SERIES OEM GRADE
• TYPE DIRECT-FIT
• FITMENT NOTES
  ?
• PART CONVERTER

 

a little late but check out the intake runner manifold control
again a little google fu on the subject will bring up tons of info on it
lots of vids on google tube as well