Engine backfiring, popping. Input please

[Ga_Z]

I have a problem. I finally got my Z running after a tank, line cleaning and a new Walbro pump. This thing has been setting for years and i was surprised at how easy it started.

 

But it does not rev past 2K unless I get it up to 1500, back off, rev it to 2000, back off, you get the idea. It smells rich. It backfires through the mass airflow and pops. If I floor it the engine just bogs like the switch is cut off. I know a tune is needed but I wondered if anyone else has had the same or similar problem. I did a few searches but didn't find anything with answers. maybe I searched wrong. I'm going to keep searching. Should I do a tune up first or does this sound like another problem? Possible MAF sensor failure? I'm trying to be as accurate as I can but am I jumping the gun?

 

Thanks for your help

[Ga_Z]

Ok, I got the FI bible and read it. Turned out is was my fuel pressure regulator. My question is now where can I find an adjustable type at a good price?

 

Also, all of the local auto parts store only carry Autolite and Champion plugs for my Z. I would like some NGKs. Got any suggestions? What do you guys use?

[MJLamberson]

Honestly I would get the auto lites for now, youl be dissapointed wehn you buy the ngk's nd foul em up quickly do to the car not running right. Ive got a good working stock fuel pressure regulator if you want it, 15$?

 

But I would also do a complete tune up if it has been sitting for a long time like you implied, plugs, wires, cap rotor, all fluids flushed, Oil change... the works

[Ga_Z]

Thanks. PM me and we'll do a deal. I would rather go used for now.

 

I will be doing the tune this weekend. I bought some Seafoam to use before the oil change. I have another set of Champions I found that I'll use for now. Once it is running good I'm on to the brakes and suspension.