97 nissan pu 2.4, runs rough,no pwr on accel, has new dist.,& all tu related on 1995 Nissan Pickup (D21)

items, keeps setting diff. misfire code p0301-p0304, new cat. put on... with cat off, still falls flat on accel and idles rough...sometimes @ high rpms runs smooth.....plz help thanks in advance...

by in Lawrenceville, GA on November 18, 2011
2 answers 2 comments
ANSWER by on November 18, 2011
Check fuel pressure and volume and for vacuum leaks. Check egr.
COMMENT by on November 19, 2011
all fp is good koeo and koer, injectors all have pulse, no vacuum leaks and all hoses replaced for good measure.
ANSWER by on November 19, 2011
Possible Intake Gasket leak, also check vacuum lines for leaks. Smoke test would be best for this situation, check with your local Technician.
COMMENT by on November 19, 2011
all fp is good koeo and koer, injectors all have pulse, no vacuum leaks and all hoses replaced for good measure. tried that. thinking ecm or ign. sw.