WSSexy

Recently I've been having a random miss and I am unable to figure out what the root cause is.. Before this happened I had a bent push rod that I replaced along with the rocker arms in cylinder 4. The issue started happening a couple weeks ago when I revved to about 6k before a shift. The car bucked a little at the high rpm and has had a random miss ever since. It has no stored codes for the miss fires but I hooked a live read computer up to it and it read 80 misses per cycle in cylinder 4, and 4 more cylinders have 15 and less per cycle. Everything I've tried so far: New heads and gaskets, coil packs, spark plugs, wires, compression tested fine.. After installing the new heads the engine makes a pshhhhhh for a second or two when its turned off like its releasing air. The intake manifold doesn't look like it sits correctly but the ports line up to the head ports. If anyone has any suggestions or information please let me know.

Mods: Richmond 3.73 gears, SLP lid, k&n filter, scoripion 1.7 rockers, 7.4 chromemoly pushrods, 243 (heads off a Silverado)

02blksscmro

Could be bent valves. I would do a compression test to verify or rule it out.

WSSexy

Intake valve on cylinder 4 was bent, that's why I put new heads on

WSSexy

New heads did fix the issue.. Symptoms were still there because of an unplugged injector and bad intake gasket.