What could be causing my car to rev high while started?

Question:
I recently had my fuel pump & filter changed be cause it wasn;t staning crank. Then I had a PCV Valve installed, two days after this the car started to rev really high. So I added fuel injector cleaner. Could there be a problem with the engine. It is a 1994 Nissan Sentra w/ Manual transmission it is the 1.4 Liter. Now it Revs up for about 5 secs then runs normaly for about 2 secs and goes back and forth. Will this ruin my engine. because my check engine light isn;'t coming on at all. I also added a fuel injector cleaner and itgo worse is this bad gas

Answers:

Ok yall i need help making lambo doors?

vacuum hose came off somewhere on the intake maifold.
Listen for a high pitched sucking noise, and feel around for a place a small hose is supose to connect to.

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What is difference between 1.4 AND 1.6 engine?

Could be a vacuum leak in the fuel pressure regulator or vacuum hose leaks.

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I have oil dripping from my tail pipe and under the car and oily residue on the back end of the van.?

your o2 sensor could be bad. your throttle position could be bad. take it in

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