98 S-series obd2 codes

[wobbles1]

hello, iam looking to fix an obd2 issue,
A few months ago i went for an inspection MIL light on. failed. printout read a egr code of pitle malfunction, tried cleaning, no effect. bought new egr from napa replaced it. egr code went away, a few weeks later same code returned. did some internet research, found a site instructing to unbolt egr from engine, but leave pigtail connected. if rpm goes above normal egr passages NOT clogged. my rpm went WAY up. so passages clear. reconnected egr. a week later code goes out then returns this time with a bad front o2 sensor. replaced o2 sensor. codes went away came back, this time egr and a code to do with a evap leak. i put car on lift. hose from engine to evap purge solenoid had come off. i put it back on code went way. over the next few weeks codes (formentioned, minus evap code kept coming back) the codes will come on for a few days (because i drive alot, college and work) then go out, then come back, and so on.

so now i have a egr code, a front o2 sensor code, and a rear o2 code.
(these are the codes that have come up, these include the evap codes that arent there anymore p0442, p1404, p0137, p0401, p0133

thank you very much

any help is greatly appreciated

[Highmile]

Start here:

http://saturnfans3.saturnfans.com/~s...d.php?t=177672

Highmile
'95 SL1 554k and counting