1997 Pathfinder SE

[LumpyHumper]

Hi, I recently replaced my VG33E 3.3L and I can't quite get it to run correctly. I'm getting a p0300 but I'm sure the distributor and TPS settings are correct. My problem is in the "throttle system", I can rev the car normally while in park or neutral, but when in drive it doesn't recognize where the pedal is correctly. I can usually get up to around 20-25mph normally until the pedal "quits being recognized". What I mean by that is that it hits a certain point and then the vehicle quits responding to the pedal. I can continue to depress the pedal but my speed doesn't increase and the RPMs only slightly. I seem to be able to find a "sweet spot" sometimes by either depressing or letting off of the accelerator just slightly, and then the vehicle will continue to accelerate normally. Besides that, the only way I can accelerate reliably is to put it to the floor and then let off once I reach the desired speed. I have found two vacuum lines under the intake hoses that I can't find where they go, and I have an exhaust leak up near the driver side that sometimes makes a loud popping noise while accelerating. I'm hoping it isn't the manifold, but that's what I think it is because I couldn't feel or hear a leak at the converter. Also, I'm new to forums so sorry for the bad format etc.





In case the images don't work, here's a link to the album: Because I can't post urls, add this behind Imgur's address "/a/D6sJL ". What is circled and has arrows is what I am talking about.

[fueler]

p0300 is random misfire. No other codes with it?

[cr4west]

Try using the service manual diagrams on this site to figure out where those vacuum lines should go.

[LumpyHumper]

Nope, no other codes other than P0300. It used to have a P0400, EGR code, but I replaced the BPT valve and that cleared up. I'm wondering if perhaps I have a sensor that is bad and crucial to the engine's operation but it isn't showing up. I have heard that's rare but possible on vehicles. I will check the service manual diagram, thanks for the tip!

[LumpyHumper]

I have a code reader that has freeze frame by the way, I will post a picture of the results because I am unsure of what they mean.

[LumpyHumper]

Thanks to user, cr4west, I was able to use the vacuum diagram and fix that issue. Really no noticeable difference in the way it runs but it didn't hurt. I have made another Imgur album with more pictures and have since removed the last album. To get to this album just add "/a/1Hbh8" to the address bar. I have included pictures of my code reader, and the freeze frame from it. I have also included a picture of my distributor and TPS. The reason being is that I feel like the TPS shouldn't be completely clocked to one side, but I could be wrong. As is, it idles at around 1-1,500 RPMs or so I'd like to say. I feel like sometimes it changes though. In gear, it drops to around where it should be, 700-800 RPMs or so. If you think it would be helpful, I could try and record some footage of what it revs and idles like in park, and then how it revs and drives in gear.