Hello i have having some trouble with my 91 civic.
1. Hard to start, sometimes wont start but sometimes will
2. When it does start, it blows some white smoke from the by the headers
3. When it does start, and put in gear and you give it gas it will bog down the RPM's go low and car shuts down. (can also happen in between gears) typically i noticed i have to rev the car higher than 2K RPM's in order for it not to shut off.

steps taking so far.
1. New TPS sensor
2. cleaned IVAC
3. Checked the main relay (works fine)
4. Checked spark plugs
5. Replaced PVC valve

if anyone could help me i would really appreciate it. i love my civic i hope to get it to run one day again.
Thanks