My car will run awesome for a day and then i go to drive somewhere and it just idles rough and it has a slight loss in power the idle is at about 1500 rpm and is popping like. Soo?? With that said... Tps? Map sensor? Coil? What? It has new ignition switch, plugs and wires and a new fuel pump relay and new fuel pump recently installed. Compression is 175 on all cylinders. Whole Car has 65k miles it sat for about 5 years while guy served in military i bought it when he got home about a month ago.im trying to boost the motor and need it to be 100% ready.

 

clean out the egr ports and the egr valve and egr valve portway and see if that fixes it

there are howto's on youtube under eric the car guy

 

^^^^ x2. Your EGR ports and EGR components are probably all gunked up if the previous owner never cleaned them.

If you're preppeing for boost, might want to clean the whole intake manifold/plenum/TB too. Might be easier to do the whole EGR job with it all out of the car, knock it all out at once. Just my two cents.

 

Thanks guys. I'm gonna tackle that job this weekend and see what the outcome is. I have been coming very well familiar with YouTube "how to do" video's lately.

 

The cleaning worked. The whole system feels so smooth and runs nice. Although now my car is doing that up down idle ****. Guess i need to grab a Tps now.

 

a tps will never, i repeat NEVER be the cause of a surging idle

you have a vacuum leak .. find it .. fix it

 

Most likely this. Make sure that your EGR manifold is correctly seated, and that the injectors are not leaking from a faulty O ring on the rail or manifold.

 

How do i find it!!!???

 

if you cleaned the egr ports its more than likely around that area.
spray some starting fluid around that area. if the rpms raise then its more than likely in that area.

 

I sprayed starting fluid every spot around the manifold and around the egr and all vacuum lines. No change in idle. Could it be a sensor of some sort? Keep in mind the car sat for 5 years, if that could be in any way relevant.

 

your egr control valve could be bad. check the vacuum line that is on the egr valve. if it has vacuum at start up the control valve is bad. the egr is only supposed to open while the vehicle is warm and running at higher rpms.
again if there is vacuum present at the egr at startup and idle, that is where your vacuum leak lies.