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Originally Posted by thomasstudios
Having problems. My 98 4x4 Chevy Tahoe has very high idle. Usually around 1000 at start, and after warmup, around 1200. I performed a tuneup w/AC Delco's, new cap/rotor, wires. Changed the IAC valve, (even though I had no codes, and the fuel pump. I am getting a P0304 and a P0507. I hear the K&N hissing really loud vacuuming air into the filter. My Bank 2 fuel trims are around -8 to -17. Bank 1 is fine usually around 0-1. Also once I begin to decelerate, it takes a while while approaching a stoplight. Very hard to stop the truck. Any Ideas? Can this be an O2 sensor? I wish I can afford to take it in or get a live readout. Getting very upset.
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if the air ducting is not secure the maf will not be able to correctly meter the amount of air entering the engine...make sure all ducting is not allowing air to bypass the MAF
when cold the idle should be 1200rpm...then in a shot time drop to about 700rpm...neutral...
the other possibility is the throttle body gasket....