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my car has a loud knock in all rpms but i sounds like a top end knock and i heard of people bending valves. it takes a long time to rev out and it has no power at all. it will barely go 40mph. the timing is good so how could i tell if its either a rod knock or a bent valve? should i do a...

i tested the ohms and it seems to be correct but i'm getting a check engine light and it won't rev past 2k rpms. i have a blow off valve and a boost controller but i turned it down to 6 psi like stock (automatic) my AFM was broken(reading no ohms) but i soldered it and i thoiught that would fix...