A new Denso MAF didn't solve my issue.
I have a hard start. Takes multiple key starts for engine to kick. When it kicks rpm is very low. I give it some gas to get around 1500 rpm and hold for several seconds. If I don't the car won't run well at all. Like the air/fuel mixture is corrupt.
Compression in engine is good 200psi
Fuel pressure going to injectors is good 45 psi
new MAF sensor
Would a logical step to look into fuel injectors? Using a stethoscope each injector is making tapping noise. Although, that doesn't prove if injector is clogged.
Codes I have are P0171, P0300, P0301, P0302, P0304
2005, 338k. Air filter is clean. The butterfly valve isn't working, the vacuum hose underneath the air box was broken. Highly doubt it's that valve. I capped the broken hose coming from the engine.
I haven't seen any other broken hose. If there's a hole and pressure escaping I haven't noticed at the moment.
The O2 sensor was changed at 100k miles. I haven't thought that could be the issue. I had an error code that lead me to that issue. Car not throwing that error code now.
O2 sensor 1 is before the cat I'm assuming.
You mentioned make sure the throttle body has the hoses connected to the correct ports. What should be connected and where? If you could send an image. I say that because a mechanic looked at my car to look at my misfires. He just said the misfires happen on initial starts but then goes away. He never fixed it. And I was told the throttle body was cleaned. And as the outside weather started getting warmer my car has been giving me this hard initial start.