p0303 and code p0300

1998 dodge stratus 2.4L automatic 93,000 miles. original problem was code p0303, cylinder 3 misfire. miss would occur at idle and especially on take off from idle. also get occasional missfire at speed. half of the time the car runs fine. replaced plug, wire, coil, and fuel injector. and ran techron through system. problem still exists. cleared code and after driving this week code p0303 reappeared, but later the check engine light and code p0300 appeared. where to turn?

a little more info:


freeze frame info for '98 stratus:

fuel sys 1 cl, using H025

calc load % 602
coolant temp 174
st ftrm1 % 10.1
lt ftrm1 % -7.0
map (in. hg) 14.5
engine rpm 672

hope that helps.

Read the threads in the forums about Neon misfires and PM me if you wish!