Idaling 1997 2.7 800 +rpm

Vacuem leak . Possibly the hoses up o
and behind intake

the problem is a mechanical issue with the crank position sensor. air gap, broken /fallen off or dirt/ rotor damage. For the abs problem check all the wires at the wheels and check for rotor damage.

Dear friend. This issues appears when we have a fuel pump problem. I had the same issue. When the fuel pump pressure is low, the eletronic injection control send a sign for EPC control to blink the engine ligth. With rpm hight you increase the pressure automtic due to hight rotation motor applied on the fuel pump. To solve it, change the fuel pump, check if you have any hose blocked with dirt and so on. Afterthat verify the eletronic injectors nozzles and the timing belt position.
Hope to help you.
Regards.

Erik Weide

high rpm when shifting into gear or high rpm at idle email at [email protected]

Check the antifreeze in the radiator and expansion bottle. Suspect that the fluid level is quite low. Use a 50:50 solution to top up. Check the engine, radiator, and all coolant hoses for signs of leakage. Check the condition of the radiator pressure cap--if the seals are swollen or broken--replace it. Hope this helps!

CHECK OIL LEVEL.LET VECHICLE SET FOR 20 MINUTES.TO ALLOW OIL FROM THE CYLINDER HEADS DRAIN BACK DOWN TO THE OIL PAN.CHECK OIL LEVEL ON DIP STICK.SHOULD BE ON THE FULL MARK.IF OIL LEVEL OKAY.DO A OIL AND OIL FILTER CHANGE IF OIL HAS NOT BEEN CHANGED IN A LONG WHILE.IF ALL IS GOOD CHECK OIL PRESSURE SHOULD BE 15 PSI@1100 RPM.IF NOT OIL PUMP WORN OR HAVE WORN INTERNAL GEARS OR FAULTY PRESSURE REGULATOR. IF OIL PRESSURE OKAY.THE OIL PRESSURE SENDING UNIT COULD BE FAULTY.

MAF sensor. Unplug it, if it smooths out, you need to replace it.

check your egr or your mafs ok

The gauge assembly on certain GM trucks were recalled. I believe 2004 - 2006, but could be more. Check with your dealer to see if your vehicle qualifies for the replacement. As to the transmission being stuck in first gear, that is an entirely different problem and could be as simple as low transmission fluid or as complex as needing a transmission rebuild. Check the fluid level and also check for a milky appearance in the fluid on the dipstick.

P0300 Random Misfire Detected

P0400 means random/multiple cylinder misfires.

Replace your spark plug cables. All of them.

Hope helped.