1997 Infiniti Q45 Questions

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The key ignition switch will not turn to start the engine
New fuel pump and still not crank
The car want crank and was accelerating bad n shutting off
The battery has been replaced as well as the starter, fuel pump and fuel pump modulator on my 1997 Infiniti Q45. But my car still only cranks but it won't start, just acts like it wants to. I've also tested the relays as well. The only codes that pulled up was for the modulator and a knock sensor code. Which way do I go now, I'm kind of at a loss.
Changed fuel pump, crank sensor, fuel pump control module. I could crank over and over but wouldnt stay running now I cant try cranking more than once it acts like battery is dead after the first cank.
Fuel light stays on constantly
Has a new battery and still cranks but won't start and has no rpm movement. Checked for spark on one of the coils and have no spark, i also checked the fuel pump modulator and it tested good. The fuel pump turns on when trying to crank the car up, but still won't start at all. Any suggestions as which way to go next. Also codes for the Knock Sensor and Fuel Pump Control Module pops up. Thx-
Because they need changing
Changed all ignition coils and plugs, but idle's rough and will hesitate big time 45-55 accleration. Timing chain so says don't mess with that? ..(i have 200k miles)...whats next? Is there a timing adjustment I could perform or is that a complete new chain, (2K?)...thanks for any help...Bam
Can start put turns over but wont start can i by pass the styem
side door relaese works , key works , but still locked
Hi Everyone,
I'm about to buy this car soon, but there are those issues mentioned and I got Idea about mechanic, fixe car specialy I'm in a hurry because i need to drive before this Monday to my new job place.
Need help , some advises how to take care of those issues A.S.A.P
i need advices concerning this car, means that is it still a good deal to buy it???? Is it gonna be ok to drive it for a long time???? is it a good car???
PROBLEMS: Power steering comes and go's (rack&pinion), check engine light due to cylinder 4 misfire .

I recently had an oil change and a few weeks later while driving my car started knocking and acceleration decreased. Now my engine is locked and wont start, what could be the problem? And oil leaked out after oil change
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