Help - Motor Dies

[jwehrheim]

Motor runs fine but after 5-10 min of driving the runs like on 2-3 cylinders and will not rev, but will when I put it in Neutral it will rev. So it seems to be a problem under load. I Replaced plugs, wires, ignition modules and bank1 o2 sensor. Ideas?
Thanks

 

[whatusername]

do a compression test

 

[Timmy_03-P5]

^^^This.

We also had a car that had a plugged cat that would do this...if you loosen the manifold bolts and it runs fine, that might be your problem. It'll be loud though haha