So last Saturday on my way to the drag races my car started making weird loping noises. I wasn't driving it hard or anything just cruising on the freeway for about 30 minutes. I got off the freeway and as soon as I started driving it in town it felt a little sluggish and makes noise as if I had solid lifters and super aggressive cams (which I don't). I checked the timing, that seemed good. I thought maybe it was an exhaust leak so I did one pass, midway though second gear I knew something wasn't right so I shut it down. I pulled all the timing covers off and checked the timing belt to see if I had somehow jumped a tooth or something, but to no avail, everything was spot on. I checked spark plugs as well, and while they didn't look fantastic, they looked in good shape, no cracked insulators or anything out of the ordinary.
Here they are
I replaced the plugs anyway for good measure. Also checked for exhaust leaks, tightened a few nuts but nothing was very loose. Still makes the same noise though. Finally got a video of it.
So my next thought is lifters...either stuck or collapsed. Any thoughts? I know it's not a spun bearing, I've heard that before on other sr's and whatnot, definitely no clack noise, maybe a hint of tick but I can't tell if that's the injectors or not. The valve train is completely stock. Most recent modification was going to Nismo 740cc injectors, but that was about a week before the noise started. The noise is audible at idle as well as at higher rpm's.
Thanks for any input.
