I have 2004 nissian altima. The car will turn over but wont start and fire up. if i pat the gas and start at same time it takes a while but will eventually fire and start. i also took it to the repair shop put on computer dignostic and got codes P0102 and P0113 and P0011 what could this be? we have replace fuel pump and crank shaft sensor and mass flow air sensor and still having problem.

SOURCE: car runs rough at idle

clean out ur throttle body, just follow the hose from the air filter to the throttle body. Need 2 people to do this. Don't remove the hose completely from the throttle body. Just enuff to be able to spray ur intake cleaner into the throttle body. Do this especially if its worse when the motor is hot, as this would confirm the problem.

SOURCE: 1999 pontiac grand prix . will not run

If wiggling the wires cured the code, then one of the wires is broken inside the insulation. Pull on each wire one at a time. look for the colored insulation to stretch, this will be the broken wire. For the other car that wont rev up, this is a common when the catalytic concverter is plugged up. This will also cause MAF codes, and in turn, TRAC OFF light.
See http://www.greatautohelp.com

SOURCE: 2000 chevy blazer, truck cranks

Does your battery go dead?

SOURCE: changed fuel pump,coil and ignighter,mass air flow,computer,relays and still wont crank

it could be yes easily

SOURCE: a p0011 code and camshaft sensor replacement did not cure problem

well i know on the v6 that is true you replaced all of them. Not sure of 4 cyl but seems like it should be the same. Also I know on the v6 the variable valve timing set up sometimes did some weird failures triggering a cam sensor code. It could be anything from sludgy oil hanging up in the vvt hub or clogged passages or bad solenoids. but before going into all that(well besides maybe an oil change) I would go for the crank sensor.