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Discussion Starter #1 (Edited)
95 RRC
I've got crap power, will drop to 45mph in 3rd gear on hills. Backfire/pop through intake (can hear it through snorkel). The backfire and really bad power came immediately after new O2;s.

Idles great. No CEL. Autologic not showing anything funny.
Maybe 5k miles on dizzy, amp, coil
New plugs, wires, rotor, cap
New coolant temp sensor
Timing good
swapped MAFs
Vacuum advance working
Compression 160ish except #4 is 147. Dry
Vacuum is low at 15 Hg, but steady. Smoked for leaks...None.
Vacuum advance working
Fuel pressure/pump good.
Pressure regulator good
No cats to be clogged
No fluid mixing/pressure issues

I assume Autologic would pick up a bad VSS.

I'm open to suggestions!!
 

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Discussion Starter #3 (Edited)
I'm embarrassed to say it ended up being bad brand new ignition parts and custom timing diagnosed by our local rover tech.

Kinda ridiculous.
 
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