Could be a partially blocked catalyst converter also.
It sounds like you might have plugged EGR passages. When the EGR valve opens, it should allow a measured amount of exhaust gases to re-enter the cylinders. This dilutes the air/fuel mixture to reduce certain emissions. When the computer tells the EGR valve to open it watches for signs that there is the proper flow of exhaust back into the cylinders. If it does not see the proper flow of exhaust, it sets a code P0401- EGR insufficient flow detected. The problem is sometimes the EGR valve itself, but since you replaced that, it is likely that the passages that the exhaust flows through have become plugged up with carbon.
To clean the carbon out, you can remove the valve and start the engine. With the engine at operating temperature, pour a small amount of combustion chamber cleaner into the passages. Don't pour too much in or you could cause a hydraulic lock in the engine which can cause major damage!!!
Be super careful when doing this as combustion chamber cleaner is extremely flammable and you are working with a running engine. You don't want to end up on fire!!!
SOURCE: 02 monte carlo, radom misfires, EGR circuit failure
Does it misfire under load like when you press on the gas peddle after slowing down then accelerate or at idle. When you say spark plug did you mean all the spark plugs?
SOURCE: loss of power...2003 chevy monte carlo
catalitic converter if car is under 80,000 miles or 8 yrs dealer must replace free i had same problem
SOURCE: 95' Monte Carlo, EGR problems.
it actualy takes a wile for them to were in so dont werry it will fix
SOURCE: code Manuel for 2003 Monte Carlo
Go to autozone.com and register the car information. It's free and you'll have access to an online repair manual for the car. The diagnostic code list should be available there. It's a rather handy resource. Hope this helped and best wishes.
SOURCE: Code P1870 for a 1996 Chevrolet Monte Carlo Z34 3.4 litre
Very common Transmission code - solution # 1 check to be sure Fluid is full . If not trans code sent plus will turn on check engine light or service engine soon . # 2 be sure condition of fluid is Good / Not worn out . Fluid must be Red / Reddish in color Cold and When hot- warm still have red / even lighter than when cold .# 3 if a higher than 50,000 mile car used in heavy rush hour traffic during hot weather then change fluid to give it fresh oil / Trans will fight heat better and save you a $$ 2000 repair bill . # 4 most important of all you can save a Trans by adding Lucas Trans treatment it is $ 20 some places but well worth $$ to extend life of vehicle if one in need of saving $$ .This can even be added to existing fluid if color is still reddish .
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