I have a 2005 suzuki forenza.. I loose coolant like its nothing no signs of leak.. Low rough idle..I replaced the plugs and wires and 02 sensor Engine light flashes at idle and stops flashing but remains on when driving?? please help

Hi Velva,here's a link to your P2187 code and what it means. P2187 System Too Lean at Idle Bank 1 DTC

This maybe due to a dirty Idle Air control valve or a throttle position sensor. YouTube can provide good answers for removal and testing of the Throttle Positon Sensor (TPS) as well as cleaning the Idle Air Control Valve (IAC)

I had the same problem in my 2006 suzuki forenza, it ended up being that my valve cover gasket was leaking engline oil all over the place, into my spark plug reservoirs and everything. When my husband replaced the gasket and cleaned all of the oil that had leaked into my spark plugs and reservoirs the problem was solved, now it runs beautifully!! Good luck

did you replace to top intake gasket you removed when you replaced the back spark plugs ,and do you torque it down right

My engine is on sometimes and then off. When it is on sometimes it blinks ?????? Check engine light ??????
The flashing light is meant to alert you that you may have a misfire in your engine that will cause catalytic converter damage if you leave the problem unresolved. Replacing a catalytic converter can be costly, so have the engine checked as soon as possible by a certified mechanic.
Don't go to advance auto parts .

The code is for an intake leak, not just the EGR valve.
In most cases the leak is the hose to the valve cover or one of the hoses to one of the sensors is damaged.
Check the hoses, and if you replace anything make sure you disconnect the battery to clear the memory of the computer.

w-d 40 ,sprayed around questionable vacume vacume lines will cause audible rpm increase in the area where a crack or hole exists.

THROTTLE POSITION SENSOR, easy to change and will cause this problem. mounts to intake. If that doesnt work, replace the idle air control solenoid. You can also replace the crank and cam position sensors later if you still have issues,

checking coolant temp sensor would be top of my list given conditions.

I would start by replacing your automatic air intake and throtle body sensor. Check these 2 things out and let me know.

tepfy