rawk krawler

Hey guys I installed a 99 intake manifold with some injectors from a 01 mustang and it Fired right up, has a terrible idle now, fluctuating between 200-1000 and stable around 450. It won't die at idle but when I try to drive (manual) it has no power, I can get up to maybe 45 mph but it bucks and has no pedal all the way to it, I can hear it back firing when it's loaded too.... I have all vacuum lines attached and it still just isn't happy. I didn't change the manifold gasket, could that cause this? I'm stuck right now because this is my only car...no check engine light either...

mdnov

Vacuum leak, bad o-rings on the injectors, injectors not seated properly. Are you sure that the injectors that you installed are compatible for your jeep?

mdnov

What year is the jeep that you put the 99 manifold on?

mdnov

Yes, you should have changed the gasket.

mdnov

One thing you can do to check for the leak is to take some carburetor cleaner around the manifold if it starts sputtering more, you found the vacuum leak. Just make sure you have a fire extinguisher handy.

Thexjfiles

Also flash the ECU if you havent already.....you made a lot of changes and the computer may be kinda confused.

rawk krawler

It's a 95, the injectors looked the same (703). O rings felt great, no fuel leaking, how do I test ecu? I'll start spraying the manifold

rawk krawler

I did just put new vacuum lines on too.

rawk krawler

Can't find anything with the spray, I don't hear any whistling either

mdnov

We're the injectors new? They might not be the correct ones. Do you have the part number?

rawk krawler

They weren't new, hey had 4 holes and thu were frm.

rawk krawler

No, pulled from junkyard v6 part number

rawk krawler

Part number fize-b4c and 9f593

rawk krawler

Please tell me they're wrong....

Donnie_K

You're sucking air somewhere, or you have an injector not spraying the way it should.